Normalize reconciliation command keyword casing without relaxing SHA validation #2205

Observed behavior

At f558617be67e51dc0ef8b6223e739e5369ec5b07, workflows/shared/squad-command-contract.mjs accepts /squad Activate but rejects /squad Reconcile Activation 123 <lowercase-64-hex-sha>. The documented lowercase /squad reconcile activation 123 <lowercase-64-hex-sha> is accepted. Uppercase SHA text is rejected.

Reproduced through the actual exported classifySquadCommand with an issue_comment payload. Mixed-case rejection is explicit (Unknown command or malformed arguments), not an authorization bypass or successful partial recovery.

Requested correction

Normalize only the reconciliation command words case-insensitively, consistently with other commands. Preserve lowercase-only 64-character SHA validation, valid positive request IDs, authorization, and output guards. Add regression cases for mixed-case keywords and invalid/uppercase hashes.

Scope and disposition

Tracked separately from #2204 to avoid extending the activation/recovery correctness repair for a command-spelling usability inconsistency. The supported lowercase recovery command remains functional; no runtime safety gate is waived.

Source: hosted review https://github.com/bradygaster/squad/pull/2204#pullrequestreview-5494233472.