docs: D79 cleanup — ALIGNMENT.md N9 + ADR 0012 Amendment 1 (D84 NO-GO) (#51)

Two governance-layer cleanup items bundled per Iron Rule 11 (same layer +
same severity). Both are docs-only, both close-loop on D79 reviewer + spike.

(1) ALIGNMENT.md N9 cross-reference — the third outside-PR nit from the D79
fresh-context reviewer (PR #50). Class-specific Exceptions section gains its
first numbered exception (Anthropic plan-usage probe via direct /v1/messages).
Previously the section said "(none at project founding)" + invited "future
Rule 3 deviation"; this entry is a Rule 2 deviation, so the section header
text was updated to "Any Rule 2 or Rule 3 deviation".

(2) ADR 0012 Amendment 1 — D84 Mistral NO-GO per 2026-05-26 spike. Per the
D79 reviewer N5 fold-in, the Mistral GO/NO-GO decision was scheduled for
D79 close (before D80 starts). Spike completed 2026-05-26 with verdict NO-GO:

- docs.mistral.ai/api has no usage/quota/credits endpoint
- Direct probe /v1/usage returns 404
- Mistral's "Limits and Usage" help points only at web console UI
- No x-ratelimit-* response headers documented on /v1/chat/completions
- OLP mistral.mjs DL-7 comment already records this from independent
  D8 investigation

Disposition: D84 row struck through in D-day plan. Mistral dashboard row in
D82 will show "spend tracking only" badge from audit-query aggregates. DL-7
remains as the documented re-entry point. Phase 5 total D-day budget revised
~6 → ~5 (anthropic-only quota probe).

Outside-PR nits N6 + N7 already addressed in ~/.cc-rules commit 9fa533a
(audit memory chronology + D-day mapping fixes).

Authority:
- N9: PR #50 review thread (D79 fresh-context opus reviewer)
- D84 NO-GO: docs.mistral.ai/api spike 2026-05-26; OLP DL-7 precedent

Co-authored-by: dtzp555 <dtzp555@gmail.com>
Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

ALIGNMENT.md

@@ -196,9 +196,19 @@ In addition to the recurring 14 May audit below, the following one-shot audits a
 
 ## Class-specific Exceptions
 
-(none at project founding)
+Any Rule 2 or Rule 3 deviation lands here as a numbered exception with PR link, reviewer, and rationale.
 
-Any future Rule 3 deviation lands here as a numbered exception with PR link, reviewer, and rationale.
+### 1. Anthropic plan-usage probe via direct `/v1/messages` call (Phase 5, D79 — 2026-05-26)
+
+**Class:** Rule 2(a) — provider-plugin scope. The Anthropic plugin's `quotaStatus()` calls `POST https://api.anthropic.com/v1/messages` directly rather than spawning `claude -p`. Under the strict reading of Rule 2(a), plugins must mirror provider-CLI behaviour; under the strict reading, this is a deviation because the spawn path goes through the CLI binary and the probe path does not.
+
+**Authority:** ADR 0002 Amendment 8 (governance) + ADR 0013 (implementation discipline) + ADR 0012 (Phase 5 charter). Schema pin: `~/.cc-rules/memory/learnings/anthropic_plan_usage_probe_schema_2026_05_26.md` (compiled-binary `strings` + live API probe evidence). PR #50.
+
+**Rationale:** Claude Code's compiled binary makes the same `POST /v1/messages` call internally (verified by `strings` over the v2.1.142 / v2.1.150 Mach-O / ELF binary). The probe mirrors that observed CLI behaviour without introducing a new wire format or output assumption. The exemption is bounded by ADR 0002 Amendment 8's three constraints (READ-ONLY, subscription-scope, idempotent-failure) + ADR 0013's seven implementation rules (notably Rule 2's per-endpoint enumeration — only `POST /v1/messages` is permitted).
+
+**Reviewer:** fresh-context opus subagent on PR #50 (Iron Rule 10 + CLAUDE.md hard requirement #3). Verdict: APPROVE_WITH_MINOR. Six in-PR nits folded in; three outside-PR nits documented and addressed (this entry is one of them — N9).
+
+**Re-evaluation trigger:** if Anthropic publishes a public documented quota endpoint (e.g. `GET /v1/usage`), this exception is RETIRED and the plugin migrates to the documented endpoint, deleting this exception by amendment PR. Until that hypothetical retirement, this exception is the canonical entry.
 
 ### Controlled deviations (entry-surface scope)