Add TestFlight-ready manual archive workflows

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Fixes #4.

Add configure_manual_release_candidate to replace an existing workflow's actions with one macOS archive and its start conditions with manual starts from an exact branch, in one PATCH. The preset requires INTERNAL_ONLY or APP_STORE_ELIGIBLE, preserves enabled/general/environment settings, and returns live read-back. General action edits now validate the nullable audience enum; workflow details label Deployment Preparation.

Apple's current OpenAPI 4.4.1 (downloaded 2026-09-07) has no post-action fields/relationships in CiWorkflow or its create/update requests, and no post-action endpoint. Responses explicitly report UNSUPPORTED_BY_APPLE_API, unknown tester-group assignment, and instructions to configure the post-action in Xcode/App Store Connect. The legacy empty list no longer implies absence. Separate build/processing/group orchestration is documented as out of scope.

Prepare version 0.6.0 in package metadata, lockfile, and MCP handshake for the requested release.

Validation on macOS:

• npm run build — exit 0.
• npm test — exit 0, 34 tests including both audiences, all cleared triggers, preserved enabled state, invalid inputs before mutation, read-back, and actual stdio schema rejection.
• npm pack --dry-run — exit 0; clean production rebuild, 69 expected package files.
• git diff --check — exit 0.

No live Apple workflow was modified: API payload behavior is tested with a fake client and checked against Apple's published schema. No native post-action or tester assignment is claimed. No new dependencies, credentials, generated artifacts, or unrelated changes.

Final exact-base/head ChatGPT review via Reasoning Relay is pending.

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Final ChatGPT review via Reasoning Relay completed.

Verdict: APPROVED
Reviewed-PR: #5
Reviewed-Base: 7250aa4
Reviewed-Head: 3893a31
Blocking-Findings: None
Non-Blocking-Findings: None

Reviewer confirmed inspection of the complete 9-file diff and relevant surrounding workflow client, formatter, tests, release/versioning, and repository configuration. No P0/P1 blockers or P2 observations.

Relay delegation: del_9d863acf-4f71-406b-a821-dc8e309f0d78
Response SHA-256: dc1623ff6fb0dfc3bbe9270a669de009fb6e99d970b83cc60db33e07cc0ab04d
Response bytes: 959.

CI Test passed; local build, 34 tests, package dry run, and diff check passed.