feat(executor): make opencode request timeout configurable

[myagizmaktav]

Summary

• add executor.opencode.request_timeout so OpenCode HTTP request lifetime is configurable
• keep backward compatibility by defaulting to 10m when unset or invalid
• cover timeout parsing and backend client wiring with focused tests

Example

executor:
  opencode:
    request_timeout: 20m

Verification

• go test ./internal/executor -run 'TestOpenCodeConfig|TestOpenCodeConfigEffectiveRequestTimeout|TestNewOpenCodeBackend' -count=1 -v
• make build

Closes #2410

[alekspetrov]

Thanks! The conflict is from commit 8663915 which duplicates the OpenCode message-schema fix that already shipped in v2.100.3 (PR #2414). Could you rebase off main and drop that commit, leaving only 8fc1c31 (the timeout config)? After rebase the diff should be limited to: backend.go, backend_opencode.go (timeout fields only), and the new backend_opencode_test.go cases for timeout parsing. Health-check changes can also drop if v2.100.3 already covers them.

[alekspetrov]

Rebased onto current main and force-pushed. Dropped the stale schema-fix commit (8663915) — that was already shipped in v2.100.3 / PR #2414. Kept only the timeout config commit (8fc1c31). Diff is now +58/−3 (down from +442/−43). Authorship preserved.

Will need workflow approval on the Checks tab to run CI.

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[alekspetrov]

LGTM. Adds executor.opencode.request_timeout with 10m default, validation, and tests. Rebased onto current main.