feat(harness): extract reusable run queue mechanics

[senamakel]

Summary

• add a generic, payload-agnostic active-run queue with steer, follow-up, and collected-context lanes
• expose queue lane/status/types through the harness and crate root
• move local OpenAI-compatible chat-template rejection classification beside the provider implementation
• document the new harness ownership boundary

API Or Behavior Changes

Adds RunQueue<T>, QueueLane, QueueStatus, and is_chat_template_rejection_message as public APIs. Existing TinyAgents behavior is unchanged; these APIs let hosts reuse queue mechanics and local-runtime error recognition without importing host metadata.

Tests

• cargo fmt --check
• cargo clippy --all-targets -- -D warnings
• cargo clippy --all-targets --all-features -- -D warnings
• cargo build --all-targets
• cargo build --all-targets --all-features
• cargo test
• cargo test --all-features

Focused additions cover empty queues, lane routing, FIFO/lane isolation, clearing, wrapped chat-template failures, case-insensitive matching, and unrelated provider errors.

Documentation

Updated docs/modules/harness/README.md with the queue responsibility, source entry, and feature-ownership boundary.

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 8acf953b-a207-480f-a575-1291349fa865

📥 Commits

Reviewing files that changed from the base of the PR and between 3e4bcad and 5e026cd.

📒 Files selected for processing (1)

• docs/modules/harness/README.md

📝 Walkthrough

Walkthrough

The harness now exposes a thread-safe FIFO queue with steer, follow-up, and collect lanes. The OpenAI provider adds chat-template rejection detection with public re-export and tests. Harness documentation describes queue ownership and layout.

Changes

Active-run queue

Layer / File(s)	Summary
Queue contract and wiring src/harness/run_queue/types.rs, src/harness/mod.rs, docs/modules/harness/README.md	Defines queue lanes and status fields. Registers and documents the run_queue module.
Queue operations and validation src/harness/run_queue/mod.rs, src/harness/run_queue/test.rs, src/lib.rs	Implements synchronized FIFO insertion, draining, status reporting, clearing, default construction, crate exports, and asynchronous tests.

OpenAI error detection

Layer / File(s)	Summary
Chat-template rejection detection src/harness/providers/openai/local.rs, src/harness/providers/openai/mod.rs, src/harness/providers/openai/local_test.rs	Matches known case-insensitive chat-template rejection phrases, re-exports the helper, and tests matching and exclusion cases.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Poem

I’m a rabbit with queues in a row,
Steer, follow-up, collect—off they go.
Errors now match with a careful ear,
Tests keep each pathway crystal clear.
Hop, hop—the harness is ready to grow!

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	Docstring coverage is 90.00% which is sufficient. The required threshold is 80.00%.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly identifies the main change: extracting reusable run queue mechanics for the harness.

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@docs/modules/harness/README.md`:
- Line 169: Update the queue module reference in the documentation from
run_queue.rs to the run_queue/ directory, matching the added
src/harness/run_queue/mod.rs layout.

🪄 Autofix

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 1b010e59-0e3a-4e95-93ec-16892edc3d96

📥 Commits

Reviewing files that changed from the base of the PR and between 27a3f39 and 3e4bcad.

📒 Files selected for processing (9)

• docs/modules/harness/README.md
• src/harness/mod.rs
• src/harness/providers/openai/local.rs
• src/harness/providers/openai/local_test.rs
• src/harness/providers/openai/mod.rs
• src/harness/run_queue/mod.rs
• src/harness/run_queue/test.rs
• src/harness/run_queue/types.rs
• src/lib.rs