docs: consolidate documentation and archive temporary reports

Step 1-2 (audit + plan): classified 35 project markdown files into
Core/Architecture/ADR/Temporary-audit/Sprint-report/Generated-review/
Duplicate/Obsolete/Historical. Agent-tooling files (.agents/skills/**,
.superpowers/**, docs/context/**, CLAUDE.md/GEMINI.md/AGENTS.md/
.github/copilot-instructions.md) explicitly out of scope — intentional
per-tool duplication, not documentation debt.

Step 3 (merge, no information lost):
- docs/PROJECT.md -> docs/PROJECT_INDEX.md, rewritten as the single
  entry point: system overview, living-doc index, archive pointer,
  current status, and a critical-finding callout up top.
- docs/backend/BACKEND-INTEGRATION.md -> docs/BACKEND_API.md,
  docs/backend/REMAINING-BACKEND-WORK.md ->
  docs/BACKEND_API_REMAINING_WORK.md (also folded in a legitimate
  uncommitted status update that had been sitting unstaged all
  session: categories marked DONE, order-creation endpoint noted done).
- RELEASE-NOTES.md merged into CHANGELOG.md (was a near-duplicate of
  the same release content in friendlier prose), then deleted.
- KNOWN-ISSUES.md: added item 13 (see below) and item 14 (missing
  canDeactivate on admin/products edit, from the archived PROJECT-STATE
  audit, re-verified still true); added a correction note to Fixed
  item 7.
- All cross-references to renamed/moved files fixed across every
  kept doc (grep+sed pass, then verified with a link-existence check
  across all 58 in-scope markdown files -> 0 broken links).

Step 4 (archive, nothing deleted without merging first): created
docs/archive/, moved 19 files there (3 root sprint reports, 1 platform
report, SPRINT-PLAN.md, and 14 one-off audit/review/report docs).
Added correction headers to the 3 archived docs whose conclusions were
affected by the finding below, rather than silently leaving them
misleading.

Step 5: docs/PROJECT_INDEX.md rewritten per the mission brief -
someone opening the repo should understand the whole system from it.

IMPORTANT FINDING (surfaced during this audit, not the mission's
primary goal but too significant to bury): pages/category/*,
pages/search/*, pages/item-detail/*, pages/info/**, pages/legal/**
(40+ files) are entirely unrouted dead code - app.routes.ts's
cmsContentRoutes is a literal empty array, and category/search/product
routes redirect to CatalogContainerComponent/
ProductDetailsContainerComponent, not these files. Confirmed against
app.routes.ts directly and cross-checked against FRONTEND.md's own
routing description. This means several fixes from earlier this cycle
(RC-Premium-01, RC STORE-01) and the dead-code cleanup sprint's
conclusion that these files were live were all wrong - documented as
KNOWN-ISSUES.md item 13, flagged at the top of PROJECT_INDEX.md, and
noted on the 3 archived docs whose conclusions it affects. No
application code was changed to fix this (out of scope per this
session's 'documentation only' constraint) - it needs a wire-it-up-or-
delete-it decision first.

Verification: tsc --noEmit clean, npm run build green, all markdown
links across 58 in-scope files resolve (checked programmatically).
No application/Angular/backend code modified.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

docs/architecture/foundation/adr/ADR-004-configuration-bootstrap-and-provider-abstraction.md

@@ -2,10 +2,10 @@
 
 Status: Superseded
 Date: 2026-07-03
-Superseded by: `docs/backend/BACKEND-INTEGRATION.md` §4 (Bootstrap) and §14 (Backend replacement pattern)
+Superseded by: `docs/BACKEND_API.md` §4 (Bootstrap) and §14 (Backend replacement pattern)
 
 ## Original decision (preserved for history)
 
 Configuration must initially come from mock JSON and later from backend API without changing consumers. `ConfigService` is the only configuration entrypoint; consumers depend on typed selectors only; provider implementation is swappable (`MockBootstrapProvider` / `ApiBootstrapProvider`); the frontend calls `GET /bootstrap` when the API provider is enabled and never passes a tenant id.
 
-This decision remains in effect. The full, verified contract — endpoint, caching, field-by-field DTO reference, and the generalized mock↔API provider-swap pattern this ADR introduced (now used by every admin domain, not just bootstrap) — lives in `docs/backend/BACKEND-INTEGRATION.md`. Read that document for current, code-verified detail; this file is kept only so ADR-numbered references in `docs/architecture/foundation/README.md` continue to resolve.
+This decision remains in effect. The full, verified contract — endpoint, caching, field-by-field DTO reference, and the generalized mock↔API provider-swap pattern this ADR introduced (now used by every admin domain, not just bootstrap) — lives in `docs/BACKEND_API.md`. Read that document for current, code-verified detail; this file is kept only so ADR-numbered references in `docs/architecture/foundation/README.md` continue to resolve.