contribution-check: offload report formatting and comment routing to small-model sub-agents

[Copilot]

The contribution-check orchestrator carried ~70 lines of static report layout rules + a full example report in its context every run, plus ~14 lines of comment routing logic — all templated work well-suited to a cheaper model.

Changes

• Removed ### Report Layout Rules and ### Example Report subsections (~70 lines) from ## Step 2: Compile Report; replaced with a one-line report-formatter agent invocation that passes the verdict array, skipped_count, and an explicit run_url (${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }})
• Replaced the 14-line ### Posting comments block (with examples/caveats) with a one-line comment-dispatcher agent invocation; clarified that the input is the JSON objects returned by the contribution-checker subagent in Step 1
• Added two inline ## agent: blocks at the bottom of the file (after {{#runtime-import shared/noop-reminder.md}}):

## agent: `report-formatter`
---
model: small
---
# groups verdict array → Ready/Needs-look/Off-guidelines markdown tables

## agent: `comment-dispatcher`
---
model: small
---
# filters verdict array → [{issue_number, body}] for non-lgtm, non-empty-comment entries

Both sub-agents use model: small. They are orthogonal to the existing file-based contribution-checker delegate and can run concurrently once subagent results land. Compiled clean with gh aw compile --strict (0 errors, 0 warnings).

[Copilot]

Pull request overview

Refactors the Contribution Check orchestrator prompt to offload report formatting and PR comment payload routing into two inline model: small sub-agents, reducing prompt bloat and templated logic in the main orchestrator.

Changes:

• Replaced the inline “Posting comments” logic with a comment-dispatcher sub-agent invocation that returns [{issue_number, body}].
• Replaced the large static report layout rules/example with a report-formatter sub-agent invocation that generates the report issue markdown body.
• Regenerated the compiled workflow lock file (compiler v0.74.8), including updated setup action wiring and environment propagation for github.server_url/github.run_id.

Show a summary per file

File	Description
.github/workflows/contribution-check.md	Moves report formatting and comment routing into two inline small-model agents and updates Step 1/2 instructions to call them.
.github/workflows/contribution-check.lock.yml	Regenerated compiled workflow/lock output reflecting the updated prompt and compiler/runtime wiring.

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• Files reviewed: 2/2 changed files
• Comments generated: 4