gsxdsm d3593065e4 FN-6960: bound PR metadata generation ...

Keep Create PR metadata generation responsive and ensure fallback PR content remains editable.

- Race metadata collection, prompt execution, and session creation against abort/timeout signals.
- Return fallback PR metadata from the API route when generation exceeds the route budget.
- Seed the Create PR dialog with editable fallback body content after metadata failures and require a non-empty body before submit.
- Validate non-empty PR bodies in both gh CLI and API-backed PR creation paths.
- Add regression coverage for bounded metadata generation, fallback responses, and PR body validation.

Files changed:
 .changeset/fn-6960-pr-metadata-bounded.md          |  7 ++
 .../dashboard/app/components/PrCreateModal.tsx     | 34 ++++++++-
 .../components/__tests__/PrCreateModal.test.tsx    | 41 +++++++++++
 .../src/__tests__/github-create-pr.test.ts         |  6 +-
 .../src/__tests__/github-forced-mode.test.ts       |  2 +-
 packages/dashboard/src/__tests__/github.test.ts    | 21 ++----
 .../src/__tests__/pr-metadata-generator.test.ts    | 55 ++++++++++----
 .../src/__tests__/pr-routes.contract.test.ts       | 10 +++
 .../register-git-github.pr-errors.test.ts          |  2 +-
 ...it-github.pr-options-preflight-metadata.test.ts | 25 +++++++
 .../dashboard/src/__tests__/routes-auth.test.ts    | 12 +--
 .../dashboard/src/__tests__/routes-github.test.ts  |  2 +-
 packages/dashboard/src/github.ts                   | 20 ++++-
 packages/dashboard/src/pr-metadata-generator.ts    | 86 ++++++++++++++--------
 .../dashboard/src/routes/register-git-github.ts    | 67 +++++++++++++----
 15 files changed, 301 insertions(+), 89 deletions(-)

Fusion-Task-Id: FN-6960
Fusion-Task-Lineage: 1ae72062-7180-4de3-999b-98d131f00792

2026-06-24 23:32:51 -07:00

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