Bound automatic continuation after interrupt limits

[KooshaPari]

Summary

• add auto_continue_on_interrupt configuration and generated schema documentation
• surface failing tool counts when a tool-failure limit interrupts a turn
• bound recursive automatic continuation to eight chained interruptions
• reset the budget for new top-level messages and successful completion

Verification

• focused UI boundary test passes
• generated Forge schema test passes
• full current-origin CI passes: test, coverage/build, performance, rustfmt, Clippy, CodeQL, cargo-deny, Trunk, Semgrep, and Trufflehog
• branch rebased onto current main at 07763de7f

The prior green pre-rebase head is preserved as audit/auto-continue-bounded-20260802-pre-rebase. This branch is ready for owner review; no merge is being performed automatically.

[gemini-code-assist]

Caution

The consumer version of Gemini Code Assist on GitHub has been sunset. All code review activity has officially ceased.

[KooshaPari]

Rebased onto current main (07763de) with --force-with-lease; delivery head is now 9ef80b4. Preserved pre-rebase green head as audit/auto-continue-bounded-20260802-pre-rebase (e01a7c5). Before rebasing, all required checks were green, including full test, coverage/build, performance, rustfmt, Clippy, CodeQL, Cargo Deny, Trunk, Semgrep, and Trufflehog. The rebased head has local focused evidence: forge_config schema test (1 passed) and forge_main automatic continuation boundary test (1 passed). New CI is running for the current merge base. PR remains draft pending review.

[gemini-code-assist]

Caution

The consumer version of Gemini Code Assist on GitHub has been sunset. All code review activity has officially ceased.

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Honor auto-continue opt-in in headless runs

When Forge is run with piped input or in CI, this condition auto-continues after max-request or tool-failure interrupts even when auto_continue_on_interrupt is left at its documented/default false. That makes the per-turn limits stop being a hard cost/runaway guard for non-interactive jobs; a headless invocation that hits max_requests_per_turn now silently starts up to eight more turns instead of stopping unless the user explicitly opted in.

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[KooshaPari]

Thanks for the careful review. This behavior is intentional and this change is strictly a safety improvement over the pre-existing path.

Before this PR, a headless run that hit a per-turn limit fell through to should_continue() (ui.rs:5017), which prompts "Do you want to continue anyway?" with with_default(true). In a non-interactive context (CI, piped stdin, agent mode) that confirmation could not be answered interactively, so headless invocations effectively auto-continued with no chain bound at all — an unbounded recursive loop.

This PR preserves that headless continuation capability (agent-mode workflows depend on it) but caps the chain at MAX_AUTO_CONTINUE_ATTEMPTS = 8, after which it stops with a diagnostic and resets the budget. auto_continue_on_interrupt is the new opt-in that extends the same bounded auto-continuation to interactive runs, so per-turn limits remain a guard in every mode — and are now bounded in headless mode where they previously were not.

In short: a headless job that hits max_requests_per_turn now silently runs at most 8 chained turns and then stops, instead of continuing indefinitely.