Chat/agent harness work: request-authority model, turn contract, tool
policy/parsing/execution, clean_agent_preview streaming/thinking, ask_user
persistence, session probes, and scheduler.
Source: vendor/photocraft (ad1cff44) harness files, 3-way merged onto
upstream/dev (a8c147b2). Harness core files were independently developed
in both lineages; resolution policy documented in pr_work/C_conflicts.md
(vendor kept where ahead, upstream kept where vendor is behind; full delta
preserved in pr_work/C_upstream_delta.patch).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
* fix(thinking): add deepseek-v4 to thinking model patterns
deepseek-v4-flash emits reasoning_content via the API but was not
recognized in _THINKING_MODEL_PATTERNS (only deepseek-r1 and
deepseek-reasoner were listed). Add the deepseek-v4 prefix so
the model is recognized as thinking-capable.
The between-round _thinkOpen leakage was separately fixed by
PR #5931 (perf(chat): batch live thinking rendering).
Related: #3998, #5931
* test(thinking): cover DeepSeek v4 detection
---------
Co-authored-by: Alexandre Teixeira <alexandremagteixeira@gmail.com>
Co-authored-by: Alexandre Teixeira <111787685+alteixeira20@users.noreply.github.com>
