feat(plan-01): Phase 0.5 — path indirection via casan-paths.sh (no file moves)

Task 1.2: introduce a single path resolver so no harness script hardcodes
`.specify/...` scattered across the tree. casan-paths.sh resolves four roots
(HARNESS/STATE/GOVERNANCE/APP) by marker-based walk-up from its own location —
never `git rev-parse` (git root is the repo PARENT here, not the app dir).

- 101 bash scripts/tests: 238 hardcoded `$PROJECT_ROOT/.specify/...` refs rewritten
  to CASAN_HARNESS_ROOT (code) / CASAN_STATE_ROOT (logs,state) / CASAN_GOVERNANCE_ROOT.
  Sandbox test vars ($WORK/$TP/$FP/$T1_WORK) left untouched.
- Roots are NOT exported: each script/subprocess self-resolves from its own tree,
  matching the original per-script semantics and preserving hermetic sandbox isolation
  (node casan-step.mjs, copied telemetry/rollback scripts must not inherit real roots).
- Sandbox tests that copy a harness script now also copy casan-paths.sh (its new
  sibling dependency): adversarial (verify-audit-chain/verify-tool-audit/rollback) +
  track-a (security-check/telemetry-integrity).
- control-plane-settings.json reclassified as STATE (untracked runtime store).

Roots all still resolve to `.specify` in this monolithic layout, so behavior is
unchanged. Full gate: PASS=64 FAIL=0 SKIP=3 (adversarial 44/0, track-a 25/0).

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

AINative_OKR_CASAN5/.specify/scripts/bash/governance-check.sh

@@ -18,8 +18,9 @@ if [[ -z "$INPUT_FILE" || -z "$OUTPUT_FILE" ]]; then
 fi
 
 SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+source "$SCRIPT_DIR/casan-paths.sh"
 PROJECT_ROOT="$(cd "$SCRIPT_DIR/../../.." && pwd)"
-LOG_DIR="$PROJECT_ROOT/.specify/logs"
+LOG_DIR="$CASAN_STATE_ROOT/logs"
 TRACE_DIR="$LOG_DIR/trace"
 AUDIT_DIR="$LOG_DIR/audit"
 mkdir -p "$TRACE_DIR" "$AUDIT_DIR" "$(dirname "$OUTPUT_FILE")"
@@ -200,7 +201,7 @@ fi
 if command -v openssl >/dev/null 2>&1; then
   # Private signing key lives OFF-REPO (default ~/.casan/audit-keys); only the
   # public key is committed. Production: replace with KMS/HSM.
-  PUB_DIR="$PROJECT_ROOT/.specify/level5/central-governance"
+  PUB_DIR="$CASAN_GOVERNANCE_ROOT"
   PRIV_DIR="${CASAN_AUDIT_KEY_DIR:-$HOME/.casan/audit-keys}"
   AUDIT_PRIV="$PRIV_DIR/audit-private.pem"
   AUDIT_PUB="$PUB_DIR/audit-public.pem"