docs(eliminate-frontend-makefile): task 4.1 - final go/no-go gate passed

Pure verification, no code changes. Confirmed all four checks against
one fresh build: /xce-build apiserver (migrated Go-test invocation,
zero make calls), meson test --suite apiserver (new backend CGO test
genuinely registered and passing), task 3.5's regression parity
(cited, same-session), and a fresh live-reference sweep (190 hits,
zero unaccounted -- corrects task 3.6's commit message, which said
188; verified byte-identical at both commits, a message-only miscount
not drift). Also independently reconfirmed the two failures blocking
a literal /xce-build all are exactly bug-1723/bug-1758 and nothing
else. Reviewer independently reproduced every check. Clear to proceed
to Makefile deletion (task 4.2).

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

.kiro/specs/eliminate-frontend-makefile/tasks.md

@@ -67,7 +67,7 @@
   - _Depends: 3.1, 3.2, 3.3, 3.4_
 
 - [ ] 4. Validation: final regression gate and Makefile removal
-- [ ] 4.1 Run the full coverage-preservation validation suite as the final go/no-go gate before deletion
+- [x] 4.1 Run the full coverage-preservation validation suite as the final go/no-go gate before deletion
   - Confirm: `/xce-build apiserver` and `/xce-build all` pass with the migrated unit-test invocation (task 2); `meson test -C <dir> --suite apiserver` passes including the new backend test target (task 1); the regression suite parity check (task 3.5) and the live-reference sweep (task 3.6) both already passed
   - Observable: a single consolidated run confirms all four checks pass together against the same build, immediately before the Makefile is deleted
   - _Requirements: 3.3, 4.3_
@@ -83,6 +83,7 @@
 
 ## Implementation Notes
 
+- Task 4.1: task 3.6's commit message said "188 hits" for the live-reference sweep; the actual, reproducible count (verified both at commit `c554ed25` and now, byte-identical) is **190** -- a message-only miscount, not drift or a missed hit; all 190 were independently reclassified with zero unaccounted. Also confirmed via a full `meson test` run that the two failures blocking a literal `/xce-build all` are exactly bug-1723 and bug-1758 (pre-existing, unrelated, NOT FIXED) and nothing else. `.claude/skills/kiro-impl/SKILL.md:171` ("...to make test pass...") is a recurring grep false positive (generic TDD prose, not an XCE Makefile reference) that will keep showing up in any future sweep of this same pattern -- expected, not a new violation.
 - Task 3.3 (round 1 rejection, fixed in round 2): when removing a stale Makefile reference from a doc, check whether the underlying script it describes still has a genuine fallback behavior before deleting the mention entirely. `run-resource-verify.sh` (task 3.1) removed its `/tmp/apiserver` fallback outright, so `xce-test-resources/SKILL.md` correctly dropped all mention of it. `deploy-ha.sh` (task 3.2) deliberately KEPT its `/tmp/apiserver` fallback logic (only removed the `make build-server` association from its text) — so `xce-deploy-ha/SKILL.md` needed to keep describing that fallback accurately (just without the Make instruction), not delete it. Two visually-similar edits, two different correct outcomes, because the two underlying scripts' behaviors diverged.
 - Task 2: `/xce-build all` currently aborts (`set -euo pipefail`) at the pre-existing `meson test --print-errorlogs` step, BEFORE reaching the migrated Go-test line — two unrelated, already-logged C-side failures (bug-1723, LeakSanitizer on `xcelib_test`; bug-1758, `sched_core_events_test` deterministic failure), both predating this spec. Task 2's `all`-case line itself is verified (byte-identical to the fully-verified `apiserver`-case line), but this means task 4.1's "final go/no-go gate" and task 4.2's post-deletion re-validation will hit the SAME pre-existing abort when running `/xce-build all` — those tasks will need to either scope their validation to `/xce-build apiserver` + a separate `meson test` invocation that tolerates these 2 known-unrelated failures, or note them as pre-existing/out-of-scope rather than treating them as a regression from this spec.
 - Task 1.2: design.md's Testing Strategy suggests `librtti_dep` as the example dependency to remove when proving the new backend test() exercises the real CGO path. Empirically (implementer + independent reviewer both reproduced this live), removing `librtti_dep` does NOT reproduce a link failure for the `apiserver/backend/...` test package — none of `librtti`'s exported symbols are actually pulled into this specific link unit's undefined-symbol set. `c_capnproto_dep` (real `capn_*` undefined-reference errors from `request.c`/`controller.capnp.c`) is the dependency that genuinely reproduces the failure and was used instead. `apiserver_cgo_deps` itself was left byte-identical to task 1.1's state (verification-only task, no permanent code change).