docs(azure): amend R4 acceptance, drop R10, correct C1 timings

[ruby-dlee]

Summary

• amend R4 so the validation-cell close and disk release are the sole acceptance leg
• record R10 as dropped while retaining the inert Slack lane as history
• correct C1 to the measured 35m33s and 44m25s local totals and document the reviewer timeout consequence
• record R6 as PARTIAL after accepted Azure cross-family-primary review azure-r4-respond-285 completed the Codex-model leg
• keep the non-Codex-model R6 leg explicitly owed and avoid attributing either C1 timing to an unrecorded reviewer family
• replace stale claims that the merged feat(crosscheck): add R6 SHA addendum and status #287 status command was absent with its lock-free, state-free serving-family view

Verification

• relevant validation, Crosscheck, Azure Crosscheck, and Slack behavior suites
• focused Crosscheck status and R6/Azure claim checks after the final docs-only update
• full pinned shell lint across 251 scripts
• diff checks and focused claim checks