chore(intake): triage codex backlog into 5 actionable TODOs + dispositions

Walked the 14-item codex enhancement backlog with Craig and recorded
dispositions in docs/design/2026-05-28-rulesets-enhancement-backlog.org
under a new "Triage Dispositions" section. The triage TODO closed.

Accept (filed below as TODOs):
- Item #8 .aiignore for agent inventory exclusions ([#C] :chore:)
- Item #10 Workflow test harness for drift and integrity tests
  ([#C] :feature:)

Pilot or scope-limit (filed below):
- Item #5 Token-tier pilot on startup.org and triage-intake.org
  ([#C] :feature:)
- Item #7 Canonical/mirror drift detection via pre-commit hook or
  make sync-check ([#C] :feature:quick:solo:). Rejected the wholesale
  dedupe. The dual source is a feature.
- Item #12 make status only ([#C] :feature:quick:solo:). Rejected the
  rest of #12.

Convention, not tracked:
- Item #11 script interface normalization (adopt as scripts are touched)
- Item #13 ADR layer (watch-and-wait on growth signal)

Reject with rationale (recorded in the backlog doc):
- Item #1 broader runtime-neutral arc. Heavy infrastructure for
  marginal payoff at current use.
- Item #3 INDEX.org compression. Already token-efficient. Parallel
  layer adds drift risk.
- Item #4 universal catalog.json. Looks valuable on paper, rots fast
  in practice.
- Item #6 install manifest JSON. Current Makefile pattern works. Data
  layer adds indirection.
- Item #9 project-facts.org. Duplicates notes.org's role.
- Item #14 local model profiles. Premature without a real use case.

Item #2 (per-agent live session files) was already filed earlier today
as the Codex Phase 1 [#B] TODO, slicing the broader item #1 arc.

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