fix(#1264): bootstrap fleet identity without a TTY

docs/reports/documentation/1264-documentation-checklist.md

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+# #1264 Documentation Completion Checklist
+
+## Required artifacts
+
+- [x] `docs/PRD.md` updated with `FCM-REQ-12` and `AC-FCM-10`.
+- [x] User workflow documents unattended fleet first start and separate prerequisites.
+- [x] Administrator operations page documents source/destination ownership, failure handling, and verification.
+- [x] Developer architecture page documents control flow, identity authority, concurrency, and non-goals.
+- [x] `docs/SITEMAP.md` and book indexes updated.
+- [x] QA evidence is under `docs/reports/qa/`; working notes are under `docs/scratchpads/`.
+- [x] Framework defaults README reflects fleet-versus-standalone behavior.
+
+## API coverage
+
+- [x] No HTTP/API endpoint or DTO changed; OpenAPI and endpoint indexes are not applicable.
+
+## Structural standards
+
+- [x] User, administrator, developer, report, and sitemap indexes link the new pages.
+- [x] No noncanonical file was added at the `docs/` root.
+- [x] Canonical documentation remains in-repo; no external publication was requested or performed.
+
+## Review gate
+
+- [x] Independent automated code/security review completed on the final uncommitted delta.
+- [x] Padded-name finding remediated and automated re-review approved with no findings.
+- [ ] Formal PR review by a reviewer other than goals/Fred completed on the exact pushed head.