Normalize GitHub bot login suffix in Devin completion binding

[jeffhuber]

Hosted Devin completion recovery reached fresh GitHub verification but found two spellings for the same bot account: dispatcher actor identity includes a terminal [bot] suffix, while GraphQL omits it. The numeric account ID and every other #932 binding matched.

This change compares author logins after removing at most one terminal [bot] suffix from either spelling. Exact numeric author ID remains mandatory, and different logins, IDs, non-terminal markers, repeated suffixes, and all existing repository/issue/branch/base/head mismatches remain rejected.

Closes #938

Validation:

• 42 focused Devin work-order, remote-session, and GitHub adapter tests pass
• Ruff, compileall, privacy scan, and doc-hygiene checks pass
• live read-only Devin: deliver authorized context packets to Devin roles and hosted builder input #932 preflight verifies the original private work-order binding, round 10 completion, merged PR, exact head, and numeric author ID

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Code Review ✅ Approved

Normalizes GitHub bot login suffix matching in Devin completion binding by comparing author logins after removing at most one terminal [bot] suffix, while keeping numeric author ID validation mandatory. All 42 focused tests pass and no issues found.

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[jeffhuber]

Claude audit (merge-authority lane)

Head SHA: 6dba0bc225ea528e083780dd95e1f32faffd86c8
Findings: P0=0, P1=0, P2=0, P3=0 (blocker policy: any P0/P1/P2 -> BLOCKED)

Claude Audit: PASS

Summary:

No P0/P1/P2 issues found.

Findings: none.