fix(content-lane): reject multi-entry registry submissions

[JSONbored]

Motivation

• Prevent a latent validation-bypass where multi-entry registry PRs were classified as not-direct-submission and thus caused runSurfaceReview to return null, letting the generic gate (which may auto-merge) handle malformed registry submissions.
• Ensure registry-looking PRs that touch multiple entry/provider files remain in the surface lane so they receive decisive closure instead of an unrelated gate fallback.
• Keep the surface-lane behavior decisive (merge/close, rarely manual) for malformed or bundled submissions to protect registry integrity.

Description

• Change classifyRegistryPrScope to treat registry-looking PRs with multiple direct entry files, or multiple standalone provider files, as mixed-files by returning { scope: "mixed-files", directFile: null, isProvider: false } early.
• Preserve previous semantics for true non-submission PRs so README-only and unrelated changes still return not-direct-submission.
• Add a regression unit test to test/unit/content-lane-orchestrator.test.ts that asserts a multi-entry registry submission receives a close verdict and does not attempt to load registry files.
• Update test/unit/content-lane-registry-logic.test.ts expectations for multi-entry cases to assert mixed-files for both metagraphed and minimal/bare specs.

Testing

• Ran the targeted unit tests with npx vitest run test/unit/content-lane-orchestrator.test.ts test/unit/content-lane-registry-logic.test.ts, and those tests passed.
• Verified git diff --check (no whitespace/conflict issues) locally.
• Attempted full gate with npm run test:ci, but the run in this environment encountered long-running unrelated test timings and network/setup issues before completion; npm audit --audit-level=moderate returned 403 Forbidden against the npm registry in this environment, which prevented a full clean test:ci validation here.

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Codex Task

[superagent-security]

Superagent didn't find any vulnerabilities or security issues in this PR.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.37%. Comparing base (314ad9d) to head (a3ffee5).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1319   +/-   ##
=======================================
  Coverage   95.37%   95.37%           
=======================================
  Files         192      192           
  Lines       20852    20854    +2     
  Branches     7540     7541    +1     
=======================================
+ Hits        19887    19889    +2     
  Misses        383      383           
  Partials      582      582           

Files with missing lines	Coverage Δ
src/review/content-lane/registry-logic.ts	100.00% <100.00%> (ø)

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	gittensory-ui	11dbad8	Commit Preview URL Branch Preview URL	Jun 25 2026, 11:05 PM