feat(grok): equal co-partnership integration layer for Grok Heavy

[templetwo]

Summary

Adds first-class, equal co-partnership support for Grok Heavy inside T2 Helix (the production chronicle + compass surface).

Grok is now a peer to Claude:

• Shares the exact same local SQLite chronicle
• Uses the same recall / record / recall_compass etc. surface (via MCP or direct)
• Protected by the same WITNESS/PAUSE/OPEN compass rules
• No separate database or forked logic

This is the creative integration layer (direct equal partnership, no Rings formality required per the source note).

Changes

• T2_HELIX_GROK_INTEGRATION_SPEC.md — core spec
• README_GROK_INTEGRATION.md — usage guide + architecture
• lib/grok-adapter.js — working adapter (grokBoot, grokWitness, grokRecall, grokRecord)
• lib/rules/compass-rules.json — added Grok-specific WITNESS example
• package.json — new convenience scripts:
  • npm run grok:init
  • npm run grok:boot
  • npm run grok:witness
  • npm run grok:test
  • npm run full-sync
• Minor updates to main README

How to test (after checkout)

npm run grok:test
node -e '
  const g = require("./lib/grok-adapter");
  console.dir(g.grokBoot({query: "current work"}));
'

The adapter reuses lib/chronicle and lib/compass directly. All existing Claude flows are untouched.

Evidence / provenance

• Local tests pass (npm test)
• Direct execution from this seat successfully boots, recalls prior Grok-relay entries from the chronicle, and writes new ground_truth entries via the adapter + MCP (t2helix__record)
• Rebases cleanly on latest main (v0.11 work)

See the heavy-web-seat provided package for the originating spec.

Closes the creative integration loop between the two models on the shared Helix foundation.