feat(doctor,hooks): loudly surface sustained vault-write failures (#243)

[CryptoJones]

Implements #243: one shared parser (hooks.vault_write_failure_streak, 64 KiB tail, never raises) behind both the new vault_writes doctor check (fail ≥5/24h with darwin TCC hint; write-probe with no residue; warn 1–4) and the SessionStart 'MEMORY WRITES ARE FAILING' banner. Troubleshooting doc section added. Manual FDA grant on the affected Mac remains operator work. 957 passed; ruff clean. Version 8.5.0.

Closes #243

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📥 Commits

Reviewing files that changed from the base of the PR and between 0fb1808 and f9851ab.

⛔ Files ignored due to path filters (1)

• uv.lock is excluded by !**/*.lock

📒 Files selected for processing (8)

• CHANGELOG.md
• docs/troubleshooting.md
• pyproject.toml
• src/omind/__init__.py
• src/omind/hooks.py
• src/omind/provision.py
• tests/test_hooks.py
• tests/test_provision.py

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