Show Forge progress directly on pull requests

[numinousmuses]

Show Forge progress directly on pull requests with one updated verification comment. The comment identifies the revision, phase, checks, and result link. New commits are checked automatically; reporting failures and superseded results cannot produce a passing status. Engineering tasks can also have a separate progress comment.

Keep the public walkthrough focused on demonstrated changes and review evidence. Internal deployment reports remain in the private platform repository, and public receipts omit model details.

flowchart LR
 subgraph Before
  A[PR update] --> B[run_ci waits for final result]
  B --> C[Commit status and workflow log]
 end
 subgraph After
  D[PR update] --> E[run_ci submits and polls task]
  E --> F[ProgressComment updates PR]
  E --> G[Verified result sets commit status]
  H[Interrupted workflow] --> I[finish_ci marks reporting interrupted]
 end

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Validation: platform race tests and Python reporting tests; real HTTP tests cover updates, pagination, spoofed markers, privacy, and stale revisions. The workflow executes trusted default-branch code. This PR runs the existing required checks; after merge, a follow-up PR exercises the new reporting path.