ErfanBagheri404 0c6ab4f99b fix(opencode): reuse one stable upstream session per identity to stop 429s ...

Follow-up to the canonical-session fix: with no explicit session,
every request minted a fresh x-opencode-session, and upstream free-tier
quota is accounted per session. That burns through quota and surfaces
as 429 FreeUsageLimitError with growing reset-after delays, while the
real CLI reuses one long-lived session per conversation.

- Stable canonical session per downstream identity (connectionId, else
  auth-header hash, else shared default), evicted after
  MEMORY_CONFIG.sessionTtlMs like the other session stores.
- Deterministic x-opencode-request per message (stable across retries,
  like the CLI user message id); valid downstream ids preserved.
- 6 more unit tests (22 total).

2026-09-17 18:03:58 +07:00

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