fix(release): republish 0.15.1; switch detection to release-existence probe

[AtelyPham]

Root cause

PR #36 (tin/consume-ui-package) merged with a merge commit preserving inner commits. The release workflow's HEAD~1 diff compared against the PR's penultimate commit which already carried 0.15.0 in package.json — so the version-change check saw no diff, changed=false, and all publish steps were silently skipped despite the workflow reporting success.

Fix

1. Bump to 0.15.1 with CHANGELOG entry explaining the republish.
2. Replace HEAD~1 diff with gh release view probe — if no GitHub release exists for v${NEW_VERSION}, publish fires. Idempotent: once a release exists, subsequent pushes skip; merge strategy no longer matters.

Triggered by: #36

[tangletools]

✅ No Blockers — 9150e9d7

Readiness 95/100 · Confidence 95/100 · 1 finding (1 low)

	kimi-code	glm	aggregate
Readiness	95	96	95
Confidence	95	98	95
Correctness	95	100	95
Security	100	100	100
Testing	100	90	90
Architecture	90	95	90

This PR is a minimal, targeted CI fix: it removes the fragile HEAD1 version-diff logic in the release workflow and replaces it with a direct 'does this GitHub release already exist?' check. The root cause (merge commit parent already carrying the bumped version, causing silent skip) is correctly identified and fixed. CHANGELOG.md and package.json are updated appropriately. No runtime code was changed. | Read all 3 changed files in full. This is a version bump (0.15.0→0.15.1), CHANGELOG entry, and a workflow fix that removes a fragile HEAD1-based version diff in favor of a simple 'does the re

🟡 LOW Unnecessary fetch-depth: 2 in release workflow — .github/workflows/release.yml

Line 22: fetch-depth: 2 was required for the old git show HEAD~1:package.json logic. The new code no longer references HEAD~1, so the fetch-depth override is unnecessary. It is harmless but can be removed for cleanliness.

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_{tangletools · 2026-05-06T18:23:08Z · trace}

[tangletools]

✅ Approved — 1 non-blocking finding

This PR is a minimal, targeted CI fix: it removes the fragile HEAD1 version-diff logic in the release workflow and replaces it with a direct 'does this GitHub release already exist?' check. The root cause (merge commit parent already carrying the bumped version, causing silent skip) is correctly identified and fixed. CHANGELOG.md and package.json are updated appropriately. No runtime code was changed. | Read all 3 changed files in full. This is a version bump (0.15.0→0.15.1), CHANGELOG entry, and a workflow fix that removes a fragile HEAD1-based version diff in favor of a simple 'does the re

🟡 LOW Unnecessary fetch-depth: 2 in release workflow — .github/workflows/release.yml

Line 22: fetch-depth: 2 was required for the old git show HEAD~1:package.json logic. The new code no longer references HEAD~1, so the fetch-depth override is unnecessary. It is harmless but can be removed for cleanliness.

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_{tangletools · 2026-05-06T18:23:08Z · trace}