Fix MCP fallback tarball discovery

[Keesan12]

Summary

• discover the locally packed MCP fallback tarball from the output directory
• remove the final dependency on npm JSON filename metadata

Verification

• exact smoke:published:pack gate: exit 0
• packaged MCP install/launch: passed
• tool surface: 22 tools
• git diff --check: exit 0

Release blocker

Trusted release run 31673182115 stopped before pack/publish at this fallback smoke. No 0.5.0 package or release was published.

Summary by CodeRabbit

• Bug Fixes
  • Improved local package smoke testing by reliably locating the generated package archive.
  • Removed fragile manual parsing and filename validation during fallback packaging.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro Plus

Run ID: e23a2ce9-2d00-401d-a266-69c366d63afb

📥 Commits

Reviewing files that changed from the base of the PR and between a9735b7 and 8d6c39f.

📒 Files selected for processing (1)

• packages/mcp/scripts/smoke-published-package.mjs

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📝 Walkthrough

Walkthrough

The smoke script now imports findSingleTarball, runs local npm pack without JSON output, and uses the shared helper to locate the generated tarball.

Changes

Local tarball resolution

Layer / File(s)	Summary
Pack and resolve the fallback tarball packages/mcp/scripts/smoke-published-package.mjs	The script replaces npm pack --json parsing and custom filename validation with findSingleTarball(tempPackDir).

Estimated code review effort: 2 (Simple) | ~10 minutes

Mergeability Score: ⚪ Minimal · up to 8d6c3

This localized change updates fallback tarball discovery, and the relevant smoke, installation, launch, and packaging checks passed. No actionable merge-blocking risk remains.

Possibly related PRs

• Keesan12/martin-loop#176: Introduces the findSingleTarball helper used by this change.
• Keesan12/martin-loop#200: Adds related release-guard tarball validation.

Poem

A rabbit packs a tarball neat,
No JSON trail beneath its feet.
The shared guard finds the file,
The smoke test runs in style.
Hop, hop—clean artifacts meet!

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: fixing MCP fallback tarball discovery by replacing manual JSON parsing with a dedicated function.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/release-pack-fallback

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