feat(plan): actionable errors, check lifecycle, soft plan enforcement

[jkyberneees]

Summary

• Actionable validation errors: every plan-tool rejection now carries the failing field path, the violated rule, a retryable flag, and a full example payload; gating errors name the blocking check ids with the exact satisfying tool calls.
• Check lifecycle: new check_replace verb replaces dead/stale checks (fresh check or equivalent-evidence note, mandatory audit-trailed justification); environment-denied checks transition to blocked which no longer gates step completion (closeout honesty only); create may always reset — the superseded checked plan is archived in the revision block, eliminating deadlock states.
• Soft runtime enforcement: planning.remind config (default OFF) injects one bounded reminder after 3 plan-less tool calls and flags late plans provisional; never a hard gate. Project config cannot re-enable it when the operator disabled it.
• Baseline eval harness: 20-scenario scripted eval with failure taxonomy (test-only, CI-hermetic) — first-attempt success 35% → 40%, deadlock class eliminated.
• Docs: docs/CONFIG.md and docs/PLANNING.md updated in the same change.

Test plan

• RED-first tests per package; full internal/loop, internal/config, internal/session, internal/telegram suites green; go vet clean; E2E with head binary shows no regressions (sandbox/Docker and API-key failures are pre-existing and environmental).
• 3 adversarial reviewers over the branch diff; all found defects fixed (single notify per check_replace, rune-safe truncation, wire rollback note).

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	odek	7cc1524	Commit Preview URL Branch Preview URL	Sep 26 2026, 03:32 PM