refactor(structure): promote app to repo root + remove redundant workspace cruft

Standard production layout: the OKR app (was nested under AINative_OKR_CASAN5/) is now
the repository root. No more wrapper directory.

- Promote AINative_OKR_CASAN5/* -> repo root (backend/ frontend/ packages/ apps/
  .specify/ docs/ infra/ nginx/ scripts/ + configs). Merge tool dirs: .gitea (kept the
  active deploy ci.yml, added harness-ci.yml + runbooks), .claude (agents/commands +
  launch.json), .github moved up.
- Remove redundant: 00_SUBMISSION_PACKAGE, scattered root notes (FPT_CASAN_Full.md,
  tu-tuong-casan.md, casan-tu-sinh..., casan_harness_assessment.md, source-review...,
  README_CASAN5_REFINED.md), casan-next-plans/ and optimize-docs/ (competition/planning
  artifacts — roadmap + design history preserved in git log / commit messages).
- Update all references to the old layout:
  - .gitea/workflows/{ci,harness-ci}.yml, .github/workflows/{ci,deploy}.yml:
    working-directory .; drop AINative_OKR_CASAN5/ prefix; .specify/{tests,scripts}
    -> packages/casan-harness/... (.specify/logs state kept)
  - .claude/launch.json, .gitea/*-runbook.md: path prefixes
  - CLAUDE.md, README.md: docs/input -> apps/okr/domain/input
  - policy-bundle.yaml: 8 policy paths -> packages/casan-harness/...; manifest re-signed
- secrets-scan.sh: fixture excludes -> new package/domain paths.

Full gate from the new root: PASS=64 FAIL=0 SKIP=3.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

packages/casan-harness/agentops/rate-limits.yaml

@@ -0,0 +1,36 @@
+version: 1.0
+description: CASAN H2 Tool rate limits — prevent runaway agent loops
+
+limits:
+  - tool: deploy
+    max_per_pipeline: 3
+    window: pipeline_run
+    note: "Max 3 deploy attempts per pipeline run before escalation"
+
+  - tool: migration
+    max_per_pipeline: 5
+    window: pipeline_run
+    note: "Max 5 migration runs — includes retries"
+
+  - tool: db_write
+    max_per_pipeline: 10
+    window: pipeline_run
+
+  - tool: write_code
+    max_per_pipeline: 50
+    window: pipeline_run
+    note: "50 write_code calls covers BE+FE implementation + up to 5 retry cycles"
+
+  - tool: external_api
+    max_per_hour: 100
+    window: rolling_60min
+
+  - tool: agent_step
+    max_per_pipeline: 200
+    window: pipeline_run
+    note: "Covers all 13 steps × max retries"
+
+enforcement:
+  on_limit_exceeded: deny
+  log_denials: true
+  log_path: .specify/logs/audit/rate-limit-denials.jsonl