chore: pin Storybook ADE canary

[kasperpeulen]

What

Pins the MCP repo default Storybook catalog entries used by apps/internal-storybook to the Storybook ADE runtime registry canary:

• storybook@0.0.0-pr-34863-sha-27c62c27
• @storybook/react-vite@0.0.0-pr-34863-sha-27c62c27
• @storybook/addon-a11y@0.0.0-pr-34863-sha-27c62c27
• @storybook/addon-docs@0.0.0-pr-34863-sha-27c62c27
• @storybook/addon-themes@0.0.0-pr-34863-sha-27c62c27
• @storybook/addon-vitest@0.0.0-pr-34863-sha-27c62c27

This is a temporary verification branch stacked on #226 so the canary-backed internal Storybook fixture can be run directly.

Validation

• npm view storybook@0.0.0-pr-34863-sha-27c62c27 version --registry=https://registry.npmjs.org/
• pnpm install
  • local install still reports ERR_PNPM_MISSING_HOISTED_LOCATIONS for ajv-formats, matching the pre-existing local node_modules issue, but packages link and commands below pass
• node version check confirmed apps/internal-storybook resolves Storybook packages to 0.0.0-pr-34863-sha-27c62c27
• pnpm --filter @storybook/mcp-proxy test
• pnpm --filter @storybook/mcp-internal-storybook storybook
• inspected ~/.storybook/instances/*.json and confirmed cwd, pid, url, port, canary storybookVersion, and mcp.status ready with /mcp endpoint
• curl tools/list against http://localhost:6006/mcp
• pnpm --filter @storybook/mcp-proxy build
• MCP SDK stdio smoke against packages/mcp-proxy/dist/bin.js calling list-all-documentation with apps/internal-storybook cwd returned isError false
• SIGINT cleanup removed the registry record

Update

CI initially failed in apps/internal-storybook/tests/check-deps.e2e.test.ts because this verification branch intentionally pins Storybook packages to a PR canary instead of the latest next dist-tag (10.5.0-alpha.0). This branch now allows Storybook PR canary versions matching 0.0.0-pr-<pr>-sha-<sha> for that freshness check so the temporary canary QA PR can go green.

The branch now uses the current Storybook PR-head canary, 0.0.0-pr-34863-sha-27c62c27.

[changeset-bot]

⚠️ No Changeset found

Latest commit: a471439

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[pkg-pr-new]

npx https://pkg.pr.new/storybookjs/mcp/@storybook/addon-mcp@232

npx https://pkg.pr.new/storybookjs/mcp/@storybook/mcp@232

npx https://pkg.pr.new/storybookjs/mcp/@storybook/mcp-proxy@232

commit: a471439

[codecov]

Bundle Report

Changes will decrease total bundle size by 78.69kB (-49.09%) ⬇️. This is within the configured threshold ✅

Detailed changes

Bundle name	Size	Change
@storybook/mcp-esm*	48.48kB	-2.17kB (-4.29%) ⬇️
@storybook/addon-mcp-esm*	5.05kB	-77.75kB (-93.9%) ⬇️
@storybook/mcp-proxy-esm	28.1kB	1.23kB (4.56%) ⬆️

ℹ️ *Bundle size includes cached data from a previous commit

Affected Assets, Files, and Routes:

view changes for bundle: @storybook/mcp-proxy-esm

Assets Changed:

Asset Name	Size Change	Total Size	Change (%)
src-CoOMfnQg.js (New)	25.0kB	25.0kB	100.0% 🚀
src-Diep_yiq.js (Deleted)	-23.77kB	0 bytes	-100.0% 🗑️

Files in src-CoOMfnQg.js:

• ./src/tools/intercepts.ts → Total Size: 4.16kB

• ./src/tools/proxy-tool.ts → Total Size: 1.73kB

view changes for bundle: @storybook/mcp-esm

Assets Changed:

Asset Name	Size Change	Total Size	Change (%)
index.js	-1.69kB	31.95kB	-5.03%
index.d.ts	-478 bytes	15.32kB	-3.03%

view changes for bundle: @storybook/addon-mcp-esm

Assets Changed:

Asset Name	Size Change	Total Size	Change (%)
preview-*.js (New)	5.05kB	5.05kB	100.0% 🚀
preset.js (Deleted)	-82.8kB	0 bytes	-100.0% 🗑️

[codecov]

Codecov Report

❌ Patch coverage is 93.60465% with 11 lines in your changes missing coverage. Please review.
✅ Project coverage is 78.24%. Comparing base (a2ab074) to head (a471439).
⚠️ Report is 86 commits behind head on main.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
packages/addon-mcp/src/tools/display-review.ts	86.66%	1 Missing and 3 partials ⚠️
packages/addon-mcp/src/auth/composition-auth.ts	78.57%	1 Missing and 2 partials ⚠️
packages/addon-mcp/src/mcp-handler.ts	50.00%	1 Missing and 1 partial ⚠️
...-mcp/src/instructions/build-server-instructions.ts	75.00%	0 Missing and 1 partial ⚠️
packages/addon-mcp/src/types.ts	80.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #232      +/-   ##
==========================================
+ Coverage   75.99%   78.24%   +2.24%     
==========================================
  Files          52       57       +5     
  Lines        1412     1558     +146     
  Branches      391      432      +41     
==========================================
+ Hits         1073     1219     +146     
+ Misses        205      203       -2     
- Partials      134      136       +2     

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