feat(eliminate-frontend-makefile): task 3.3 - update live documentation (11 files)

Removes every live current-fact reference to src/frontend/Makefile
targets or Makefile-specific fixed paths across 11 docs (steering,
frontend/CLAUDE.md, root CLAUDE.md, deployment docs, and two skill
docs), replacing with the Meson-based equivalents established by
tasks 1-3.2: /xce-build apiserver, meson test --suite apiserver,
direct tests/regression/run.sh invocation.

Round-1 review rejected the first pass: xce-deploy-ha/SKILL.md had
over-corrected by deleting all mention of deploy-ha.sh's still-real
/tmp/apiserver legacy fallback (that script's discovery logic is
unchanged, unlike run-resource-verify.sh's, which genuinely lost its
fallback in task 3.1 -- xce-test-resources/SKILL.md's identical-
looking edit was correct for that reason). Fixed by restoring an
accurate, Makefile-free description of the real fallback at all four
touched sites. Re-reviewed and approved.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01XYdtrEWWZfKRRGED7raEYg

CLAUDE.md

@@ -39,7 +39,7 @@ For details on any topic below, read the corresponding steering file in `.kiro/s
 - **Save/restore field-completeness**: any persistence mechanism (WAL fact, scheduler snapshot, checkpoint) must capture every field of the entity it claims to persist — a state that "recovers correctly" while silently missing a field it depends on (e.g. `job.state` correct but `job.allocs` lost) is a bug, not an acceptable simplification, unless the omission is explicitly documented as a scope decision (see `persistence.md`'s "Snapshot Save/Load Field-Completeness" + `APPLY_CLEAN`/bug-1678 sections). When adding or extending save/restore logic, verify the field round-trips through BOTH the write side and every read/apply seam, and run `/xce-audit-invariants` (controller dimension 7 / scheduler dimension 4) rather than assuming a passing test suite already proves it — `APPLY_CLEAN`-style verdicts check row counts and cursor position, not per-field completeness
 
 ## Key Files
-- `src/frontend/Makefile` — primary build/test orchestration
+- `src/tools/xce-build.sh` — primary build/test orchestration (Meson-based; see `build-deployment.md`)
 - `src/frontend/apiserver/cmd/main.go` — server startup, init sequence
 - `src/frontend/apiserver/router/routers.go` — all routes and middleware chain
 - `src/frontend/apiserver/controllers/rbac_check.go` — RBAC loading and enforcement