Promote test -> main

[anderdc]

Summary

Promotes 7 commits from test to main:

• cd3e26e Fetch base content for deleted PR files (Fetch base content for deleted PR files #21)
• 92b3c3b Fix label actor role evidence (Fix label actor role evidence #14)
• a4e4c11 Fix stale PR file fetch completion (Fix stale PR file fetch completion #12)
• 56cb417 feat(miners): unbound OPEN issues when since is omitted (feat(miners): unbound OPEN issues when since is omitted #27)
• 9dc9c76 fix: clear solved_by_pr when issues reopen (fix: clear reopened issue solved_by_pr credit #24)
• 433d2b1 Normalize response shapes (Normalize response shapes #8)
• 73e6a05 Add open source templates and contributor docs

Prod schema migration (runbook)

packages/db/ is only applied to fresh volumes, so prod needs the following SQL applied manually after merge. Both changes are idempotent on a clean prod (no existing constraint, no schema drift on the view).

From #8 — pull_requests gains a CHECK that MERGED rows have a merged_at. If any prod row violates it, backfill before adding (or use NOT VALID + VALIDATE CONSTRAINT after backfill).

From #14 — contributor_repo_roles view now unions reviews and comments alongside PRs/issues, and orders by observed_at, source_rank, source_key so reviewer/commenter associations contribute to the latest known role.

BEGIN;

-- From #8: enforce merged_at on MERGED pull_requests
ALTER TABLE pull_requests
    ADD CONSTRAINT pull_requests_merged_has_merged_at
        CHECK (state != 'MERGED' OR merged_at IS NOT NULL);

-- From #14: rewrite contributor_repo_roles to include reviews + comments
CREATE OR REPLACE VIEW contributor_repo_roles AS
SELECT DISTINCT ON (repo_full_name, author_github_id)
    repo_full_name,
    author_github_id,
    author_login,
    author_association
FROM (
    SELECT
        repo_full_name,
        author_github_id,
        author_login,
        author_association,
        created_at AS observed_at,
        10 AS source_rank,
        'pr:' || pr_number::text AS source_key
    FROM pull_requests
    WHERE author_github_id IS NOT NULL
      AND author_github_id <> ''
      AND author_association IS NOT NULL

    UNION ALL

    SELECT
        repo_full_name,
        author_github_id,
        author_login,
        author_association,
        created_at AS observed_at,
        10 AS source_rank,
        'issue:' || issue_number::text AS source_key
    FROM issues
    WHERE author_github_id IS NOT NULL
      AND author_github_id <> ''
      AND author_association IS NOT NULL

    UNION ALL

    SELECT
        repo_full_name,
        reviewer_github_id AS author_github_id,
        reviewer_login AS author_login,
        reviewer_association AS author_association,
        submitted_at AS observed_at,
        20 AS source_rank,
        'review:' || pr_number::text || ':' || submitted_at::text AS source_key
    FROM reviews
    WHERE reviewer_github_id IS NOT NULL
      AND reviewer_github_id <> ''
      AND reviewer_association IS NOT NULL

    UNION ALL

    SELECT
        repo_full_name,
        author_github_id,
        author_login,
        author_association,
        COALESCE(updated_at, created_at) AS observed_at,
        30 AS source_rank,
        'comment:' || comment_id::text AS source_key
    FROM comments
    WHERE author_github_id IS NOT NULL
      AND author_github_id <> ''
      AND author_association IS NOT NULL
) combined
ORDER BY repo_full_name, author_github_id, observed_at DESC, source_rank DESC, source_key DESC;

COMMIT;

24_view_pr_labels_by_actor.sql changed in #14 but only in comments — no DDL to apply.

Test plan

• Merge PR
• Run the SQL block above against prod from psql inside a transaction
• Verify \d pull_requests shows pull_requests_merged_has_merged_at
• Verify contributor_repo_roles returns rows for a known reviewer-only or commenter-only contributor