Implement Codex CLI streaming and image attachments

[slashdevcorpse]

Summary

• Streams Codex CLI assistant output into the chat UI as progressive server-sent events.
• Passes supported image attachments to codex exec through temporary image files and validates attachment payloads at the API boundary.
• Persists command execution tool-call and result events so CLI activity is visible in session history.
• Adds parser coverage for cumulative assistant snapshots, token deltas, ignored non-assistant events, and final assistant output.

Validation

• pnpm -C apps/codex-claw test
• pnpm -C apps/codex-claw build
• pnpm -C apps/landing build
• pnpm pack:codex-claw
• pnpm audit --audit-level low

Closes #11
Closes #12

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Summary by cubic

Streams Codex CLI assistant responses into the chat UI via SSE and adds image attachment support by passing validated images to codex exec as temporary files. Also persists command execution tool-call and result events so CLI activity appears in session history (closes #11, #12).

• New Features

  • Streams assistant deltas and final text; merges snapshots/token deltas and ignores non-assistant events.
  • Validates and normalizes image attachments (PNG/JPEG/GIF/WebP); rejects invalid base64 with clear 400 errors.
  • Writes images to temp files and passes them via --image to codex exec; cleans up after runs.
  • Persists command execution start/result as tool messages and emits them via SSE; adds tests for parsing and text merging.

• Bug Fixes

  • Show tool call messages only when part.type is toolCall to fix ordering.
  • Include name in the attachment payload from the chat UI.

^{Written for commit 2dcb825. Summary will update on new commits.}

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