feat: OACP v0.3.3

[kiloloop-release]

OACP v0.3.3 — patch release.

Added

• oacp watch --state-id <id> for per-subscriber cursor files, allowing concurrent watchers of the same agent inbox to receive the same new-message events without sharing a cursor.

Changed

• Docs: refreshed the runtime capability matrix and prompt-caching guidance for current runtime releases.

Fixed

• oacp send --oacp-dir and oacp inbox --oacp-dir now expand ~ through the shared OACP home resolver instead of treating it as a literal path component.
• Inbox and outbox delivery writes now use same-directory temp files plus atomic replace so readers do not observe partial .yaml messages.
• Memory archive tests now isolate git config while preserving test identities, so local commit-signing settings do not break the suite.

Staged from oacp-release main. Leak audit clean.

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