🧺 feat: Preserve Partial Work at Tool Call Limits (#15486)

* feat: Handle reaching the agent tool-call limit gracefully

When the graph exhausts its per-turn step budget, persist the turn as
unfinished with finish_reason tool_call_limit instead of a red error.
Warn the model as the budget runs low, and offer Keep going or Answer now.

* docs: Add screenshots of the tool-call-limit notice

Light and dark captures of the unfinished-turn card for the PR description.

* style: Tighten the tool-call-limit notice card

Pin dismiss to the top-right with uniform rounding, use a slightly
smaller hit target, and round the card to xl. Refresh the PR screenshots.

* fix: Address Copilot review findings on the step-budget path

Skip empty and subagent-scoped PostToolBatch events when counting
rounds. Drop the double-cast in the notice test helper and coerce the
tool-call-limit finish reason in the Continue-gate spec.

* fix: Address Codex review findings on budget and dismiss

Pass the resolved recursion limit into the OpenAI-compatible
processStream path so the step-budget hook matches the graph.
Reset the notice dismiss state when the displayed message id changes.

* fix: Unblock CI typecheck and import sorting

Declare recursion_limit on the OpenAI service agent type, sort that
file's local imports, and route the notice test context through unknown
so tsc accepts the partial ChatContext fixture.

* fix: Sort remaining PR imports for static checks

* chore: Remove tool-call-limit notice screenshots

* fix: Keep recovery actions from consuming composer drafts

Pass empty file, skill, and quote overrides on Keep going and Answer
now so a staged compose is not attached or drained.