merge: integrate origin/main (v0.18.1.0) into open-agents-learnings

Main moved forward 6 commits while this branch was local. Integrated
both sides preserving all functionality:

From main (v0.16.4.0 → v0.18.1.0):
- v0.17.0.0 — UX behavioral foundations + ux-audit (generateUXPrinciples,
  {{UX_PRINCIPLES}} placeholder, triggers frontmatter on skills)
- v0.18.0.0 — Confusion Protocol, Hermes + GBrain hosts, brain-first
  resolver (generateBrainHealthInstruction, generateConfusionProtocol,
  generateGBrainContextLoad, generateGBrainSaveResults, hosts/gbrain.ts,
  hosts/hermes.ts, scripts/resolvers/gbrain.ts, GBrain bash health check)
- v0.18.0.1 — ngrok Windows build fix
- 0cc830b6 — tilde-in-assignment permission fix
- cc42f14a — gstack compact design doc (tabled)
- 822e843a — headed browser auto-shutdown + disconnect cleanup (v0.18.1.0)

Integration approach: keep this branch's preamble.ts submodule refactor
as the structure of record. Extracted main's two new generators into
their own submodules:
- scripts/resolvers/preamble/generate-brain-health-instruction.ts
- scripts/resolvers/preamble/generate-confusion-protocol.ts

Updated scripts/resolvers/preamble/generate-preamble-bash.ts to absorb
main's GBrain health check (host-conditional on gbrain/hermes).

scripts/resolvers/index.ts now imports BOTH:
- This branch's adds: MODEL_OVERLAY, TASTE_PROFILE, BIN_DIR resolvers
- Main's adds: UX_PRINCIPLES, GBRAIN_CONTEXT_LOAD, GBRAIN_SAVE_RESULTS
  resolvers

scripts/resolvers/design.ts keeps both generateTasteProfile (this
branch) and generateUXPrinciples (main). Sibling exports, no overlap.

scripts/gen-skill-docs.ts keeps both this branch's --model flag wiring
and main's edits.

Templates auto-merged where possible. The 35 generated SKILL.md /
golden conflicts auto-resolved via `bun run gen:skill-docs --host all`
followed by re-snapshotting the ship goldens for claude/codex/factory.

Verification:
- bun run gen:skill-docs --host all completes cleanly
- bun test: 1 pre-existing failure (gstack-community-dashboard Supabase
  network test, 235s timeout). NOT related to merge — unchanged Supabase
  test infra times out without live network. Flagged in PR body.

Token-ceiling warnings on plan-ceo-review (29K), office-hours (26K),
and ship (34K). These existed on origin/main before the merge — the
preamble grew substantially from main's GBrain + UX additions plus this
branch's continuous-checkpoint, context-health, model-overlay, taste-profile,
and feature-discovery additions. Worth a follow-up reduction pass but
doesn't block this merge.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

browse/SKILL.md

@@ -9,6 +9,10 @@ description: |
   ~100ms per command. Use when you need to test a feature, verify a deployment, dogfood a
   user flow, or file a bug with evidence. Use when asked to "open in browser", "test the
   site", "take a screenshot", or "dogfood this". (gstack)
+triggers:
+  - browse a page
+  - headless browser
+  - take page screenshot
 allowed-tools:
   - Bash
   - Read
@@ -488,7 +492,7 @@ State persists between calls (cookies, tabs, login sessions).
 _ROOT=$(git rev-parse --show-toplevel 2>/dev/null)
 B=""
 [ -n "$_ROOT" ] && [ -x "$_ROOT/.claude/skills/gstack/browse/dist/browse" ] && B="$_ROOT/.claude/skills/gstack/browse/dist/browse"
-[ -z "$B" ] && B=~/.claude/skills/gstack/browse/dist/browse
+[ -z "$B" ] && B="$HOME/.claude/skills/gstack/browse/dist/browse"
 if [ -x "$B" ]; then
   echo "READY: $B"
 else
@@ -642,6 +646,7 @@ The snapshot is your primary tool for understanding and interacting with pages.
 -a        --annotate              Annotated screenshot with red overlay boxes and ref labels
 -o <path> --output                Output path for annotated screenshot (default: <temp>/browse-annotated.png)
 -C        --cursor-interactive    Cursor-interactive elements (@c refs — divs with pointer, onclick). Auto-enabled when -i is used.
+-H <json> --heatmap               Color-coded overlay screenshot from JSON map: '{"@e1":"green","@e3":"red"}'. Valid colors: green, yellow, red, blue, orange, gray.
 ```
 
 All flags can be combined freely. `-o` only applies when `-a` is also used.
@@ -772,6 +777,7 @@ $B prettyscreenshot --cleanup --scroll-to ".pricing" --width 1440 ~/Desktop/hero
 | `network [--clear]` | Network requests |
 | `perf` | Page load timings |
 | `storage [set k v]` | Read all localStorage + sessionStorage as JSON, or set <key> <value> to write localStorage |
+| `ux-audit` | Extract page structure for UX behavioral analysis — site ID, nav, headings, text blocks, interactive elements. Returns JSON for agent interpretation. |
 
 ### Visual
 | Command | Description |