fix: harden MCP publish probes

[lifeodyssey]

What changed

• Gives production verification requests a stable Share HTML publisher user-agent and JSON accept header.
• Adds bounded retry, timeouts, and response-body diagnostics.
• Logs which production endpoint is being verified.

Why

The first MCP Registry publish attempt was safely blocked because GitHub-hosted runners received HTTP 403 while the same public endpoints returned 200 from local production checks. The stronger probes preserve exact manifest/version/tool validation while making edge-policy failures diagnosable.

Validation

• actionlint .github/workflows/publish-mcp.yml
• git diff --check
• Local production manifest, MCP initialize, and MCP tools/list requests all return 200 with exact expected shapes

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 1411b648-7d01-4572-8f62-8786cfca8b0e

📥 Commits

Reviewing files that changed from the base of the PR and between 2029c4a and 252bd12.

📒 Files selected for processing (1)

• .github/workflows/publish-mcp.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/mcp-registry-publish-fix

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