fix(forge): publish FastAPI validation to trunk

[fronzec]

Closes #12

Summary

• Publish the already-reviewed FastAPI request-validation snapshot to main.
• Recover the child slice after PR feat(forge): migrate FastAPI request validation #14 was merged into the already-merged PR feat(forge): migrate FastAPI system history #13 branch.
• Preserve the exact six-file, 329-line payload from commit 9e691e9.

Why This PR Exists

PR #13 merged into main first. PR #14 still targeted feat/fastapi-project-migration, so merging #14 updated that branch but did not place its snapshot on trunk. GitHub reported #14 as merged while main...9e691e9 remained diverged and issue #12 stayed open.

Changes

Area	Change
web-framework-basics/request-validation/python-fastapi/	Reapply the exact validated request-validation snapshot.
README.md	Restore its Forge catalog entry.

Test Plan

• Confirmed PR feat(forge): migrate FastAPI request validation #14's commit is not contained in main.
• Reapplied only commit 9e691e9 onto current main.
• Verified git diff --check and the expected 6-file, 329-line scope.
• Reused the dependency, import, and live HTTP evidence recorded in the snapshot README and PR feat(forge): migrate FastAPI request validation #14.

Contributor Checklist

• Linked approved issue feat(forge): migrate FastAPI request validation #12.
• Used conventional commit format.
• Kept the recovery payload identical to the reviewed child slice.
• Added no AI attribution or co-author trailers.

[fronzec]

• fix(forge): publish FastAPI validation to trunk #15 👈 (View in Graphite)
• main

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[fronzec]

Merge activity

• Jul 19, 1:59 AM UTC: A user started a stack merge that includes this pull request via Graphite.
• Jul 19, 1:59 AM UTC: @fronzec merged this pull request with Graphite.