chore: replace template TODOs; holdings not product stubs (salvage from stale phase11-final) (#106)

## Summary

Salvage of the **unique** content from the stale `chore/phase11-final`
branch (PR #105, being closed as superseded).

The substance of `chore/phase11-final` (Phase 11 docs, CRG/TRG
close-out, `AFFIRMATION.adoc`, `PHASE-11-FINAL.adoc`,
`CRG-AUDIT-2026-09-20.adoc`) **already landed in `main` via #104** —
byte-identical on both sides. The old branch also predates #104's
holdings rulings (H1–H4), so merging it as-is would have **resurrected**
`archetypes/`, `www/dns/`, `.machine_readable/coaptation/`,
`.machine_readable/arrival-pack/` and **reverted** the coprocessor
catalogue and `docs/reports/PONS-ASINORUM.adoc`.

This PR keeps only what the old branch had that `main` does not: the
template-`TODO` cleanups from its last commit (`chore: replace template
TODOs; holdings not product stubs`).

## Changes

- `Justfile` — `deps-audit`: drop the template TODO block; keep the
trivy-if-present audit.
- `src/api/README.adoc` — honest description (Zig fail-closed adapter,
ROADMAP H8) instead of "Holding directory … TODO".
- `.machine_readable/descriptiles/LANGUAGES.deed` — `:core "TBD"` →
`:core "not-implemented"`.
- `ci/`, `tests/e2e/`, `tests/shape/`,
`.machine_readable/contractiles/{adjust,intend,must,trust}/README.adoc`
— `TODO: see ROADMAP (Phase 1 structural placeholders)` → honest holding
note.

## Testing

Docs/config-only; no code paths touched. `just spec-tests` gates
unaffected.

Signed-off-by: Jonathan D.A. Jewell <j.d.a.jewell@open.ac.uk>

Author: hyperpolymath