fix(git): ci-queue-wait.sh — parse the payload it was handed, not stdin (#1019)

Both python sites piped a status payload into `python3 - <<'PY'`. The heredoc binds
stdin to the program text, so `json.load(sys.stdin)` saw EOF, the bare `except` fired,
and the parser returned "unknown" for every input — success, pending and failure alike.
"unknown" then reaches a silent `exit 0` arm.

Consequence: the gate-6 queue guard has never made a determination. It exits 0 on every
invocation, on both the gitea and github paths (one shared parser). The pending wait
loop, --require-status and the 124 timeout were all unreachable code. What it still
validated was connectivity — an unresolved token, head sha, or platform could exit 1.

Fix is the one already shipped in the sibling: capture the payload with `payload=$(cat)`
before invoking python, pass it by environment. pr-ci-wait.sh:38 has carried a comment
describing this exact bug — "yielding EOF and returning unknown every time" — along with
the remedy. It was never backported to the sibling the constitution makes mandatory
before every push and merge.

Adds test-ci-queue-wait-parse.sh, enumerated in test:framework-shell. Every assertion is
on the RETURNED STATE STRING; a suite asserting only rc=0 passes against the broken build,
which is how this survived. Verified by mutation: against the pre-fix wrapper the suite
fails 10 of 14, and the four that pass are the four for which passing is correct (the
undecodable-input control, the unknown-vocabulary case, and both needle halves).

The needle scans with heredoc semantics rather than matching text. `json.load(sys.stdin)`
is correct under `python3 -c`, where the program comes from argv and stdin really is the
payload — ci-queue-wait.sh uses that form legitimately in gitea_get_branch_head_sha. A
flat grep flags that innocent site; the scanner names only the two defective ones.

Out of scope, deliberately, and recorded on #1019: token-in-argv (ps-visible) and the
hardcoded BRANCH="main". Bundling them would make a safety-critical parse fix harder to
review.

Refs #1019

packages/mosaic/package.json

@@ -25,7 +25,7 @@
     "lint": "eslint src",
     "typecheck": "tsc --noEmit",
     "test": "vitest run --passWithNoTests && pnpm run test:framework-shell",
-    "test:framework-shell": "python3 src/lease-broker/daemon_deadline_unittest.py && python3 src/lease-broker/normative_fragments_unittest.py && python3 src/lease-broker/receipt_challenge_unittest.py && python3 src/lease-broker/context_recovery_unittest.py && python3 src/lease-broker/recovery_runtime_unittest.py && python3 src/lease-broker/recovery_b1_adversarial_unittest.py && python3 src/lease-broker/framework_skill_portability_unittest.py && python3 src/mutator-gate/runtime_tools_unittest.py && python3 src/mutator-gate/runtime_launch_guard_unittest.py && python3 src/mutator-gate/version_coupling_unittest.py && python3 framework/tools/lease-broker/check-runtime-launches.py --root ../.. && bash framework/tools/codex/test-pr-diff-context.sh && bash framework/tools/qa/test-deps-preflight.sh && bash framework/tools/git/test-pr-review-gitea-comment.sh && bash framework/tools/git/test-pr-review-repo-host-override.sh && bash framework/tools/git/test-ci-queue-wait-branch-absent.sh && bash framework/tools/git/test-git-credential-mosaic.sh && bash framework/tools/git/test-gitea-token-identity.sh && bash framework/tools/_scripts/test-install-ordering-guard.sh && bash framework/tools/tmux/agent-send.test.sh && bash framework/tools/wake/test-wake-store-ack.sh && bash framework/tools/wake/test-wake-store-enqueue-race.sh && bash framework/tools/wake/test-wake-digest-hmac.sh && bash framework/tools/wake/test-wake-digest-quarantine.sh && bash framework/tools/wake/test-wake-detector.sh && bash framework/tools/wake/test-wake-fn-oracle.sh && bash framework/tools/wake/test-wake-reconcile.sh && bash framework/tools/wake/test-wake-beacon.sh && bash framework/tools/wake/test-wake-preimage.sh && bash framework/tools/wake/test-wake-install.sh"
+    "test:framework-shell": "python3 src/lease-broker/daemon_deadline_unittest.py && python3 src/lease-broker/normative_fragments_unittest.py && python3 src/lease-broker/receipt_challenge_unittest.py && python3 src/lease-broker/context_recovery_unittest.py && python3 src/lease-broker/recovery_runtime_unittest.py && python3 src/lease-broker/recovery_b1_adversarial_unittest.py && python3 src/lease-broker/framework_skill_portability_unittest.py && python3 src/mutator-gate/runtime_tools_unittest.py && python3 src/mutator-gate/runtime_launch_guard_unittest.py && python3 src/mutator-gate/version_coupling_unittest.py && python3 framework/tools/lease-broker/check-runtime-launches.py --root ../.. && bash framework/tools/codex/test-pr-diff-context.sh && bash framework/tools/qa/test-deps-preflight.sh && bash framework/tools/git/test-pr-review-gitea-comment.sh && bash framework/tools/git/test-pr-review-repo-host-override.sh && bash framework/tools/git/test-ci-queue-wait-branch-absent.sh && bash framework/tools/git/test-ci-queue-wait-parse.sh && bash framework/tools/git/test-git-credential-mosaic.sh && bash framework/tools/git/test-gitea-token-identity.sh && bash framework/tools/_scripts/test-install-ordering-guard.sh && bash framework/tools/tmux/agent-send.test.sh && bash framework/tools/wake/test-wake-store-ack.sh && bash framework/tools/wake/test-wake-store-enqueue-race.sh && bash framework/tools/wake/test-wake-digest-hmac.sh && bash framework/tools/wake/test-wake-digest-quarantine.sh && bash framework/tools/wake/test-wake-detector.sh && bash framework/tools/wake/test-wake-fn-oracle.sh && bash framework/tools/wake/test-wake-reconcile.sh && bash framework/tools/wake/test-wake-beacon.sh && bash framework/tools/wake/test-wake-preimage.sh && bash framework/tools/wake/test-wake-install.sh"
   },
   "dependencies": {
     "@mosaicstack/brain": "workspace:*",