docs: restore casan-next-plans roadmap into docs/plans (was wrongly deleted)

The plan set (Plan-00..18, backlog/hardening/QA status, team allocation) is the ONGOING
roadmap, not a finished competition artifact — restored from history into docs/plans/.
Plan-01 (restructure) marked ✅ done; the rest remain to do.

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

docs/plans/CASAN_PLAN_10_TRACEABILITY_EVAL.md

@@ -0,0 +1,41 @@
+# CASAN PLAN 10 — Traceability REQ→Code→Test + H3 Eval
+
+> Status 2026-07-06: **MVP implemented + tested**. Scope is deterministic
+> traceability for the OKR sample app; broader H3 eval-set expansion remains a
+> platform follow-up.
+
+## MVP delivered
+
+| Capability | Where | Verification |
+|---|---|---|
+| Parse `FR-*` from `docs/input/okr-requirement.md` | `.specify/scripts/bash/traceability-matrix.py` | `phase10-traceability-tests.sh` |
+| Declarative FR→code→test map | `.specify/traceability-map.json` | gate checks every mapped file exists |
+| Gate every FR has >=1 code file and >=1 test file | `traceability-matrix.py --gate` | missing FR test coverage fails |
+| **Symbol/line-level refs** (object form `{file, symbols, lines}`, backward compatible with plain path) | `traceability-matrix.py` (`resolve_files`, `symbol_present`) | `phase10` symbol/line checks (missing symbol/line ⇒ gate FAIL) |
+| Evidence Pack includes traceability matrix | `evidence-pack-build.py` | `phase3-evidence-pack-tests.sh` expects 13 files |
+| **CI enforcement** | `ci-harness-gate.sh` runs `phase10-traceability` | CI fails a new FR without code+test (+symbol) coverage |
+
+> Verify môi trường: chạy trong **WSL/Linux** (msys + Python Windows lệch dịch path → fail giả). phase10 = **6/0** trong WSL.
+
+## Current result
+
+```bash
+python3 .specify/scripts/bash/traceability-matrix.py --gate
+# TRACEABILITY_MATRIX requirements=5 pass=5 fail=0 symbols=2/2 ...
+
+bash .specify/tests/phase10-traceability-tests.sh   # chạy trong WSL
+# TRACEABILITY SUMMARY: PASS=6 FAIL=0
+```
+
+Generated artifact:
+
+- `AINative_OKR_CASAN5/docs/output/casan/traceability-matrix.json` (nạp thêm `symbol_refs`, `missing_symbols`, `missing_lines`)
+
+## Next steps
+
+| Priority | Work | Done when |
+|---|---|---|
+| ~~P1~~ ✅ | ~~Symbol/line-level refs~~ **đã làm** | matrix trỏ tới symbol/line chính xác; missing ⇒ gate FAIL |
+| ~~P3~~ ✅ | ~~Enforce traceability in release CI~~ **đã có** | `ci-harness-gate.sh` chạy `phase10` |
+| P2 | Expand H3 eval-set beyond the OKR sample app | independent eval corpus runs through judge gates |
+| P4 | Enrich symbol refs cho các FR còn lại (FR-02→FR-05) | mỗi FR có ≥1 symbol ref được verify |