Report generated images as ACP locations

[tulsi-builder]

Summary

• report a generated image’s canonical savedPath through ACP locations
• use the same helper for normal completion and completed-only/history projection
• terminalize replayed image generation items even when Codex persisted the historical generating status
• omit locations when the saved path is absent or blank
• cover completion, replay, missing/blank paths, matching image URI, and failed generations

Testing

• npm test — 335 passed, 28 skipped
• npm run typecheck
• npm run build
• live image generation: terminal tool_call_update contained image data, URI, and matching locations[0].path
• replay of an existing image session: terminal tool_call contained image data, URI, and matching locations[0].path
• git diff --check

This keeps rawOutput.savedPath diagnostic-only while allowing ACP clients to treat generated images as formal artifacts.

[tulsi-builder]

🤖 Maintainer note: the fork-origin CI workflow is currently awaiting approval (action_required). I ran the full local suite successfully (335 passed, 28 skipped), plus typecheck and build. I also validated both a fresh image generation and replay of an existing Codex image session; each emitted terminal status, inline image data/URI, and a matching ACP location.