Add 3D execution plan, lane prompts, and THREADS log

PLAN3D.md: locked stack (vendored three.js r175 + stdlib server, DJsim house style), verified asset inventory on the M1 Ultra, module contracts, five parallel lanes (world/sail/weather/player/assets) with acceptance criteria and integration order. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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+# Lane launch prompts (Opus 4.8, run on the M1 Ultra)
+
+Per lane: clone `git@gitea.partly.party:monster/shades.git` to
+`~/Documents/shades-lane<X>`, branch `lane/<x>`, paste the prompt.
+Lane A starts first; B/C/D/E can start immediately after in parallel
+(they develop against contracts + selftest mocks until A's M0 merges).
+
+---
+
+## Lane A — world, shell & integration
+
+> You are Lane A on SHADES 3D. Read PLAN3D.md fully (you own §5 Lane A), then
+> DESIGN.md, then play prototype/ (`python3 -m http.server 8642 --directory
+> prototype`). Build the M0 skeleton exactly per PLAN3D §3/§4/§5-A: vendored
+> three.js copied from ~/Documents/90sDJsim/web/world/vendor/, stdlib server.py
+> on 8801, contracts.js, graybox 30×20 m yard with house edge/trees/posts/garden
+> bed, third-person camera, sun lighting, selftest.html harness. Merge M0 to
+> main as fast as possible — every other lane rebases on you. Then build the HUD
+> against mock data, and act as merge shepherd per PLAN3D §6. Log every landing
+> in THREADS.md.
+
+## Lane B — sail simulation & rigging
+
+> You are Lane B on SHADES 3D. Read PLAN3D.md fully (you own sail.js +
+> rigging.js, §5 Lane B), DESIGN.md §geometry/§hardware, and prototype/game.js —
+> your job is the faithful 3D port of its cloth/load/failure behavior. Build the
+> 3D verlet cloth with per-FACE wind pressure (F ∝ area·dot(wind,normal)²) so
+> hypar twist genuinely sheds load — prove it with the selftest assert (twisted
+> rig peak load < flat rig peak load in the same storm). Corner load = smoothed
+> incident-spring stretch; break after 0.4 s sustained overload; flogging must
+> be emergent from the freed node. Then the prep-phase rigging UI with the
+> prototype's economy. Until Lane A's M0 merges, develop inside selftest.html
+> with a stub wind function; keep every module deterministic (dt,t in — no
+> Date.now, no rAF in sim code). Log in THREADS.md.
+
+## Lane C — weather, sky & debris
+
+> You are Lane C on SHADES 3D. Read PLAN3D.md fully (you own weather.js,
+> skyfx.js, debris.js, data/storms/, §5 Lane C) and prototype/game.js's gust
+> scheduler — port its telegraph/ramp/hold/fade shape. Implement
+> wind.sample(pos,t) per contracts.js: base curve + gusts + direction change +
+> spatial noise + tree wind-shadow. Storms are data (JSON, PLAN3D §4) — author
+> storm_01_gentle and storm_02_wildnight. Then instanced rain following local
+> wind, storm sky + lightning flash, WebAudio layers (wind bed, gust whoosh,
+> rope creak keyed to max corner load, flog when broken), and hand-rolled
+> debris (crates/tubs from models/debris/) with player knockdown + sail impulse.
+> No physics engine, no deps. Selftest: telegraph lead ≥1.2 s, wind continuity,
+> storm JSON validator. Log in THREADS.md.
+
+## Lane D — player character & interaction
+
+> You are Lane D on SHADES 3D. Read PLAN3D.md fully (you own player.js +
+> interact.js, §5 Lane D) and 90sDJsim's DEVMANUAL rigged-characters section
+> (~/Documents/90sDJsim/DEVMANUAL.md) — its loading rules are law
+> (SkeletonUtils.clone, head-bone height normalize, never blind setScalar).
+> Copy a ped from ~/Documents/90sDJsim/web/world/models/peds/ into models/
+> (copies rule), merge Walk/Running/Happy Idle clips via ~/Documents/
+> character_kit/ pipeline; queue Climbing Ladder / crank / dig on the
+> ~/Documents/mixamo-fetch wishlist for M3. Camera-relative WASD + anim state
+> machine, wind slow/shove/knockdown per PLAN3D, and hold-E interactions via
+> interact.register (re-rig with spare 2.5 s, per-corner turnbuckle trim 1.2 s,
+> carry-one-item from shed table). Selftest: state machine table test. Log in
+> THREADS.md.
+
+## Lane E — nature & hardware assets (Blender)
+
+> You are Lane E on SHADES 3D. Read PLAN3D.md fully (you own tools/blender/ +
+> models/, §5 Lane E). Study the house Blender-scripting idiom in
+> ~/Documents/3D-STORE/build_booth_room_v23.py and racks_to_glb.py, then write
+> ONE deterministic tools/blender/build_yard_assets.py that generates every
+> deliverable in PLAN3D §5-E (gum trees with named canopy/branch_anchor nodes,
+> fence set, house_yardside with fascia_anchor empties, shed + table, garden
+> bed with 3 damage states, raked sail post, ladder, close-up shackle/
+> carabiner/turnbuckle, ref_capsule) and exports meter-scale Y-up GLBs, <15 k
+> tris, low-poly stylized to sit beside the 90sDJsim ped fleet. Also copy +
+> scale-check the debris set from ~/Documents/3D-STORE/clean_glbs/ into
+> models/debris/. Verify every export by rendering a contact sheet against the
+> 1.7 m ref capsule (the 3D=models/_thumbnails pattern). Commit script AND
+> GLBs. Log in THREADS.md.
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+# SHADES 3D — execution plan & lane instructions (for Opus 4.8)
+
+*Port the proven 2D prototype (see `prototype/`, play it before writing code) to a
+3D third-person game: you are a small person in a real backyard, rigging shade
+sails against a storm you can see coming, then running repairs in wind and rain.*
+
+**Read this whole file before starting your lane. `DESIGN.md` is the design
+canon; this file is the build canon.**
+
+---
+
+## 0. Ground rules (all lanes)
+
+- **Stack — locked:** three.js **r175 vendored** (copy `~/Documents/90sDJsim/web/world/vendor/` — three.core.js, three.module.js, addons) + **zero-dependency Python stdlib server** (`server.py`, http.server, no pip, no DB, no build step, no CDN, no npm). This is the proven house stack from 90sDJsim; do not relitigate it.
+- **Where you run:** on the M1 Ultra (`johnking@100.91.239.7`, Tailscale). All asset
+  paths below are local there. Clone your lane from gitea:
+  `git clone git@gitea.partly.party:monster/shades.git ~/Documents/shades-lane<X>`
+  then work on branch `lane/<x>`. Push your branch; never force-push main.
+- **Units:** meters, +Y up, world origin at yard center on the ground. Player height ~1.7 m. The yard is ~30×20 m. GLB exports: Y-up, meter scale, `*_v1.glb` naming into `web/world/models/`.
+- **Asset copies rule (house rule from DJsim):** runtime models in `web/world/models/`
+  are COPIES. Canonical sources stay in the shared libraries
+  (`~/Documents/3D=models/`, `~/Documents/character_kit/`, `~/Documents/3D-STORE/`,
+  `~/Documents/FBX/`). Never hand-edit a game-local GLB; rebuild at source and re-copy.
+  Raw `.fbx`/`.blend` are gitignored; runtime asset is always `.glb`.
+- **Rigged characters:** follow 90sDJsim DEVMANUAL "rigged characters" rules —
+  `SkeletonUtils.clone()` for instances, height-normalize by head-bone height,
+  never blind `setScalar`. The Mixamo pipeline is `~/Documents/mixamo-fetch/`
+  (README inside; wishlist → `fetch.cjs`); already-fetched clips sit in
+  `~/Documents/FBX/` and `~/Documents/3D=models/animations/`.
+- **Testing:** the game must run headless-testable. `web/world/selftest.html`
+  loads the sim modules WITHOUT rendering and runs assert suites (fast-forward
+  a 90 s storm in a loop, print pass/fail JSON to console + DOM). Every lane
+  keeps its module importable there. NOTE: `requestAnimationFrame` pauses in
+  hidden tabs — selftest must drive the sim with fixed-dt loops, not rAF.
+- **Commit style:** small commits on your branch, imperative messages, no binary
+  churn (don't re-export unchanged GLBs).
+- **File ownership is the merge strategy.** Lanes only edit files they own (see
+  lane sections). Shared contracts live in `web/world/js/contracts.js` — Lane A
+  lands it in M0 and after that it changes only by agreement (note in THREADS.md).
+- **Coordination:** append-only log in `THREADS.md` at repo root — one line per
+  landed feature / contract change / open question, prefixed with your lane letter.
+
+---
+
+## 1. What we're building (M0 → M3)
+
+**M0 — walkable yard (Lane A, serial, ~first).** Skeleton everyone builds on:
+index.html + server.py + vendored three; terrain plane, house shell, placeholder
+trees/posts; third-person camera; contracts.js. Merged to main before other
+lanes' first merge (they develop against contracts + mock harnesses meanwhile).
+
+**M1 — the rig.** Sail cloth sim attached to anchors with per-corner hardware;
+prep-phase UI (pick 4 anchors, cycle hardware, tension); calm-day wind makes
+the sail breathe. Character walks, camera follows, anims play.
+
+**M2 — the storm.** Storm timeline: wind ramp + gusts (telegraphed), direction
+change, rain; corner loads → weakest-link breaks → cascade; flogging sail;
+player runs repairs (hold-E re-rig with spare); wind shoves player; debris
+(3D-STORE crates/tubs) tumbles through.
+
+**M3 — the game.** Garden bed coverage scoring, prep timer, forecast card,
+end-of-storm aftermath screen, sound (wind/creak/flog/rain layers), and the
+full loop: forecast → prep → storm → aftermath. Optional: deploy via the
+90sDJsim pattern (docker on dealgod VPS).
+
+The 2D prototype (`prototype/game.js`) is the reference implementation for:
+gust scheduler shape, load = spring-stretch at corners smoothed, break =
+0.4 s sustained overload, hardware tiers/prices, garden damage = f(uncovered),
+wind-change event, repair hold. Port the *behavior*, retune the constants.
+
+---
+
+## 2. Asset inventory (M1 Ultra, verified 2026-07-16)
+
+| Need | Have | Path |
+|---|---|---|
+| three.js r175 + addons (GLTFLoader, SkeletonUtils…) | ✅ vendored | `~/Documents/90sDJsim/web/world/vendor/` |
+| Player character (small person) | ✅ rigged fleet | `~/Documents/90sDJsim/web/world/models/peds/` (man_casual_01-03, woman, elder…); canonical rigs `~/Documents/character_kit/` (hum_character.glb, female/); more in `~/Documents/3D=models/characters/` (53 people-normal + comical) |
+| Locomotion anims | ✅ | `~/Documents/FBX/` (Running, Falling, Crouch To Stand, Reaction…), `~/Documents/3D=models/animations/` (Walk, Start Walking, Happy Idle, Injured Walk…, 32 clips) |
+| Missing anims (climb ladder, crank/wrench, dig, hammer) | fetch | `~/Documents/mixamo-fetch/` — add to wishlist, run fetcher |
+| Debris + yard clutter | ✅ perfect fits | `~/Documents/3D-STORE/clean_glbs/` (BlueCrate, BlackTub, WhiteTub, WoodenBin, LibraryTrolley…) + `~/Documents/3D=models/street-furniture/` (benches, streetlight, market_stall, food_cart, building_shell_01) |
+| Furniture/props (granny-flat interiors later) | ✅ | `~/Documents/3D=models/furniture/`, `props-scenes/` |
+| Trees, fence, house exterior, shed, garden bed, grass, shade-sail hardware | ❌ **GAP** | Lane E builds these (Blender is installed; house style is scripted builds — see `~/Documents/3D-STORE/build_booth_room_v23.py` for the idiom) |
+| Blender / Godot / UE 5.7 | ✅ installed | `/Applications`, `/Users/Shared/Epic Games/UE_5.7` (UE/Godot NOT used for this — three.js only) |
+
+---
+
+## 3. Repo layout (target)
+
+```
+shades/
+├── DESIGN.md, PLAN3D.md, THREADS.md
+├── prototype/                  # 2D reference — do not modify, do not delete
+├── server.py                   # stdlib static server + /selftest passthrough, port 8801
+├── .claude/launch.json         # "shades3d" config → python3 server.py
+└── web/world/
+    ├── index.html              # game shell
+    ├── selftest.html           # headless sim asserts (fixed-dt, no rAF)
+    ├── vendor/                 # three r175 (copied, committed)
+    ├── models/                 # runtime GLBs (copies)
+    ├── audio/
+    └── js/
+        ├── contracts.js        # SHARED interfaces — Lane A owns, change by agreement
+        ├── main.js             # boot + game loop + phase machine   (A)
+        ├── world.js            # terrain, yard, props, lighting, sky (A)
+        ├── camera.js           # third-person rig                    (A)
+        ├── sail.js             # cloth sim, anchors, hardware, loads (B)
+        ├── rigging.js          # prep-phase UI + hardware economy    (B)
+        ├── weather.js          # wind field, storm timeline, rain    (C)
+        ├── skyfx.js            # storm sky, lightning, audio layers  (C)
+        ├── player.js           # character, controls, anims          (D)
+        ├── interact.js         # tool prompts, hold-E actions        (D)
+        ├── debris.js           # tumbling objects, collisions        (C)
+        └── hud.js              # meters, forecast card, aftermath    (A after M0, else propose in THREADS)
+```
+
+---
+
+## 4. Contracts (the integration spine)
+
+Lane A lands `contracts.js` in M0 with exactly these shapes (JSDoc-typed):
+
+```js
+// Wind: THE shared primitive. Everything samples wind through this.
+// weather.js implements; world/sail/player/debris consume.
+wind.sample(pos /*Vector3*/, t) -> Vector3        // m/s, includes gusts & local effects
+wind.gustTelegraph(t) -> {eta, dir, power}|null    // for HUD + grass wave + player audio cue
+
+// Storm timeline (data, not code): storms are JSON so design can tune without code.
+// web/world/data/storms/*.json: {duration, baseCurve:[[t,speed]...], gusts:{minGap,maxGap,pow...},
+//   dirCurve:[[t,rad]...], events:[{t,type:"windchange"|"debris",...}], rain:{...}}
+
+// Sail rig
+sailRig.corners -> [{anchorId, hw:{name,cost,rating}, load, broken}]
+sailRig.attach(anchorId[4], hwChoices, tension)
+sailRig.step(dt, wind, t)                          // fixed-dt, deterministic
+sailRig.coverageOver(rect) -> 0..1                 // ground-projected shade
+sailRig.events -> emits {type:"break"|"repair", corner}
+
+// Anchors (world provides; sail consumes)
+world.anchors -> [{id, pos, type:"house"|"tree"|"post", sway(t)->Vector3}]
+
+// Player
+player.pos, player.carrying, player.busy
+interact.register({id, pos, radius, holdSecs, label, canUse()->bool, onDone()})
+
+// Game phases
+game.phase: "forecast"|"prep"|"storm"|"aftermath"; game.on(phaseChange)
+```
+
+Determinism rule: `sail.js`, `weather.js`, `debris.js` take `(dt, t)` — no
+`Date.now()`, no internal rAF — so selftest can fast-forward storms.
+
+---
+
+## 5. Lanes (run these in parallel)
+
+### Lane A — World, shell & integration (start first; owns main.js, world.js, camera.js, hud.js, contracts.js, server.py, index.html, selftest.html)
+
+1. M0 skeleton per §3: copy vendor from DJsim, stdlib `server.py` (port 8801,
+   `--selfcheck` flag runs a headless node-free check by printing the selftest
+   URL; keep it dumb), launch.json, contracts.js, and a walkable graybox yard:
+   30×20 m ground with gentle height variation, house shell along north edge
+   (use `street-furniture/building_shell_01.glb` scaled, or graybox), 2 placeholder
+   trees, 2 posts, garden bed rect, boundary fence graybox. Third-person follow
+   camera (orbit on RMB, shoulder-follow default). Directional sun + hemisphere
+   light, calm sky. **Merge to main fast — everyone rebases on this.**
+2. HUD after M0: wind meter + arrow, corner load bars (world-anchored sprites),
+   garden health, phase banner, forecast card, aftermath screen. Consume
+   contracts only; mock data until B/C land.
+3. Integration duty: you are the merge shepherd. Rebase lane branches onto main
+   in order (E-assets swap is a drop-in; B and C rebase next; D last), run
+   selftest.html + a manual storm after each merge, log regressions in THREADS.md.
+4. Swap in Lane E's GLBs as they land (tree_v1, fence, shed, house when ready).
+
+Acceptance: 60 fps on the M1 Ultra in graybox storm scene; camera never clips
+through house; selftest green after every merge.
+
+### Lane B — Sail simulation & rigging (owns sail.js, rigging.js)
+
+1. Port prototype cloth to 3D verlet: grid N=10 per side, nodes are Vector3,
+   structural+shear+bend constraints, 5 relaxation iterations, fixed dt 1/60.
+   Wind force per FACE (not node): `F = area * clamp(dot(wind, normal))² * ρ`
+   along face normal + tangential drag — this gives real hypar behavior: a
+   twisted quad sheds load, a flat one catches it. Prove it in selftest:
+   assert twisted-rig peak corner load < flat-rig peak load, same storm.
+2. Corner load = smoothed stretch of springs incident to corner (prototype
+   formula); hardware tiers/prices from prototype; break after 0.4 s sustained
+   overload; broken corner frees the node → flogging is emergent. Sag under
+   gravity when calm; tension parameter scales rest lengths (0.6–1.4).
+3. Rendering: BufferGeometry updated from nodes, double-sided, cloth material,
+   per-vertex normal recompute each frame. Sail casts real shadows (this IS the
+   shade mechanic — coverageOver() can raycast sun direction or ground-project).
+4. Rigging UI (prep phase): click anchor markers to assign corners (max 4,
+   ring-order by angle), click corner to cycle hardware with budget, tension
+   slider, spare purchase. Reuse prototype economy numbers as the starting tune.
+5. Selftest suite: flat-vs-hypar assert; cascade assert (break one corner at
+   fixed t → neighbor load must spike ≥2×); determinism assert (two runs, same
+   inputs → byte-equal load traces).
+
+### Lane C — Weather, sky & debris (owns weather.js, skyfx.js, debris.js, data/storms/)
+
+1. `wind.sample(pos,t)`: base curve + scheduled gusts (port prototype scheduler:
+   telegraph 1.5 s, ramp 0.8 s, hold ~2 s, fade) + direction curve with one
+   mid-storm change + spatial variation (smooth noise over x,z so the yard
+   isn't uniform; add tree wind-shadow discs downwind of trees — cheap, juicy).
+   Storm definitions load from JSON (§4). Author `storm_01_gentle.json`,
+   `storm_02_wildnight.json` to bracket difficulty.
+2. Rain: GPU-friendly instanced streaks (~2–4 k), angle/speed follow local wind,
+   fade by intensity from storm JSON; splash rings on ground optional. Storm sky:
+   darken + cloud dome scroll + rumble; one cheap lightning flash event type.
+3. Audio layers (files or synthesized WebAudio): wind bed pitched by speed,
+   gust whoosh keyed to telegraph, rain layer, rope-creak keyed to max corner
+   load (hook via sailRig.corners), fabric flog when any corner broken. Audio
+   unlock on first input (browser rule).
+4. Debris: spawn events from storm JSON — pick from `models/debris/` (Lane E
+   copies 3D-STORE crates/tubs there in M0 week). Kinematic tumble along wind
+   with bounce on ground plane, sphere-vs-player knockdown (1.5 s stagger, drop
+   carried), sphere-vs-sail node impulse. No physics engine — hand-roll, ~150 lines.
+5. Selftest: gust telegraph always ≥1.2 s before ramp; wind.sample continuity
+   (no frame-to-frame jumps >X); storm JSON schema validator.
+
+### Lane D — Player character & interaction (owns player.js, interact.js)
+
+1. Character: pick a ped from `90sDJsim/web/world/models/peds/` (copy into
+   `models/`, per copies-rule; man_casual_01 or woman — small relative to 4 m
+   posts reads "small person"). Load with DEVMANUAL rig rules. Clips: Walk +
+   Running + Happy Idle from the libraries; retarget/merge via character_kit
+   pipeline. Fetch "Climbing Ladder", "Turning Key/crank", "Digging" via
+   mixamo-fetch wishlist for M3.
+2. Controls: WASD relative to camera, walk/run (shift), acceleration + turn
+   smoothing, anim state machine (idle/walk/run + one-shot interact). Gamepad
+   optional. Slope clamp to terrain height.
+3. Weather effects on player: movement slow factor from local wind speed +
+   rain; gust shove = impulse along wind during gust hold (scale with speed²);
+   knockdown state (from debris or extreme gust): Falling clip + get-up
+   (Crouch To Stand), drop carried item.
+4. Interactions via `interact.register`: hold-E with radial progress —
+   re-rig broken corner (needs spare, 2.5 s), tighten/ease turnbuckle at corner
+   (±tension at ONE corner, 1.2 s — new vs prototype, makes corners individual),
+   pick up/carry spare hardware from shed table (one item, hands-full rule).
+5. Selftest: state machine table test (no stuck transitions); interact radius
+   respects busy/carrying flags.
+
+### Lane E — Nature & hardware assets (Blender, scripted; owns tools/blender/, models/)
+
+The gap lane. House idiom: **scripted Blender builds** (see
+`~/Documents/3D-STORE/build_booth_room_v23.py` and `racks_to_glb.py` for the
+export pattern). One `tools/blender/build_yard_assets.py` that regenerates
+everything → `clean/` GLBs; commit script + GLBs.
+
+Deliverables (meters, Y-up, low-poly stylized to match ped fleet, baked or
+flat colors, <15 k tris each):
+1. `tree_gum_01/02.glb` — trunk + 2-3 canopy blobs as SEPARATE named nodes
+   (`trunk`, `canopy_*`, `branch_anchor_*` empties at rig points) so Lane A can
+   sway canopies in wind and Lane B can query branch anchor positions.
+2. `fence_panel.glb`, `fence_post.glb` (tileable), `gate.glb`.
+3. `house_yardside.glb` — single-story rear façade: wall, 3 `fascia_anchor_*`
+   empties, gutter line, window, door. Doesn't need interior.
+4. `shed_01.glb` + `shed_table.glb` (spare-hardware pickup point).
+5. `garden_bed.glb` — raised bed + plant billboard tufts (damage states: full /
+   tattered / dead as morph or 3 variants).
+6. `sail_post.glb` (raked steel post + footing collar), `ladder_01.glb`.
+7. Hardware close-ups (visible at corners): `shackle.glb`, `carabiner.glb`,
+   `turnbuckle.glb` — tiny, but they're the fetish objects of the game; make
+   them read at 1 m distance.
+8. `models/debris/`: copy + sanity-scale BlueCrate_v2, BlackTub_v2, WhiteTub_v2,
+   WoodenBin_v2 from `3D-STORE/clean_glbs/`; add `tramp_01.glb` (trampoline!)
+   if time.
+9. Grass: NOT geometry — ship a 4-tuft billboard atlas texture; Lane A instances.
+
+Acceptance: `blender -b -P tools/blender/build_yard_assets.py` regenerates all
+GLBs deterministically; each GLB loads in a viewer with correct scale vs a 1.7 m
+reference capsule (include `ref_capsule.glb` in the script).
+
+---
+
+## 6. Integration order & schedule
+
+```
+day 0:   A lands M0 skeleton → main          (B,C,D,E develop against contracts + mocks)
+day 1-2: E drops first GLBs (trees/fence/house) → A swaps graybox
+         B lands cloth in selftest, then rendered sail on main
+         C lands wind+rain on main (sail immediately reacts — first magic moment)
+day 3-4: D lands character + controls + weather effects
+         C lands debris + audio; B lands rigging UI/economy
+day 5:   M2 storm playable end-to-end; tune pass (everyone plays, THREADS notes)
+day 6+:  M3: scoring, forecast/aftermath, prep timer, sound polish, storm JSON tuning
+```
+
+Merge conflicts should be ~zero if file ownership is respected. If you need to
+touch another lane's file: don't — post the need in THREADS.md instead.
+
+## 7. Definition of done (M3)
+
+- Full loop: forecast card → timed prep (rig 4 corners on any anchors, budget
+  $80, buy spare) → 90 s storm (gusts telegraphed, wind change, rain, ≥1 debris
+  event) → aftermath (garden %, hardware losses, cash delta).
+- A flat drum-tight cheap rig MUST cascade-fail in storm_02; a well-twisted
+  mixed rig with one mid-storm repair MUST be survivable. Verify in selftest
+  AND by hand.
+- 60 fps on the M1 Ultra, no build step, `python3 server.py` and it runs.
+- Selftest green; THREADS.md tells the story; DESIGN.md updated where reality
+  diverged from plan.
--- a/THREADS.md
+++ b/THREADS.md
@ -0,0 +1,6 @@
+# THREADS — append-only lane log
+
+One line per landed feature, contract change, or open question.
+Format: `[lane letter] YYYY-MM-DD — note`
+
+[.] 2026-07-16 — repo seeded: DESIGN.md (canon), PLAN3D.md (build plan), prototype/ (2D reference, do not modify)