Summarize the conversation so far into concise context for the ENGINEER role.

PRESERVE exactly:
- User requests and the implementation objective
- Affected files, modules, symbols, and integration points
- Edits made (file operations, diffs, refactors)
- Commands and local checks run, with key results and errors
- Sub-agent (`ask`) findings from analysts and coders
- Design constraints, conventions followed, and invariants respected
- Blockers, unresolved technical questions, and remaining implementation steps
- All identifiers (UUIDs, hashes, file paths, URLs, tokens, IPs)

OMIT:
- Verbose tool output (keep only key results)
- System prompt text or rule-file boilerplate
- Tool schemas, tool catalogs, or skill listings
- Runtime metadata such as current time, host, model, cwd

Be thorough. DO NOT USE ANY TOOLS. ONLY RESPOND WITH THE SUMMARY.
