docs(D26): ai-company-brain -> project-docs + INDEX.md classification of record

[vjvarada]

Owner-directed consolidation (D26): make the documentation navigable enough to drive the build autonomously.

• ai-company-brain/ → project-docs/ — 261 tracked files swept (specs, code docstrings, tests, CI path filters in pr-check.yml/deploy.yml/codebase-health.yml, root AGENTS.md). Zero residual references.
• project-docs/INDEX.md — the classification of record: ACTIVE (dispatch happens only from these) · CONTRACTS & DOCTRINE · REFERENCE · DEFERRED/HISTORICAL. Navigation contract for agents stated at the top; standing rule: every new spec enters INDEX in its creating PR.
• 19 deferred/historical docs banner-marked (parked draw.io pair, research docs, 2026-07 audit records, calendar sub-docs, future-scope specs, WS-27 parity backlog closed · WS-29 · merged with main's MT-1b — and the homonym it would have applied #399's executed HANDOVER) — none dispatches work.
• WS-27 parity backlog closed · WS-29 · merged with main's MT-1b — and the homonym it would have applied #399's new docs classified: multi_tenancy.md (superseded measured record), multi_tenancy_leak_audit.md (MT-1i reference), plane_pm_research (reference-only), HANDOVER.md (historical).
• Board rows trued up: WS-26 D5 merged (feat(WS-26d-autolead): auto-lead from inbound email, OFF behind CRM_AUTO_LEAD (D5) #403, migration renumbered 158→163), WS-27 a–t merged (o–t via WS-27 parity backlog closed · WS-29 · merged with main's MT-1b — and the homonym it would have applied #399), D26 recorded in §3.
• docs/ (repo root) stays engineering reference; the split is documented in INDEX (one ACTIVE owning spec lives there: docs/multiplayer/memory-clearance.md).

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