fix: report skipped gates as skipped, and honour ai.majorUpgrades.maxAttempts

[glennmichael123]

Two more settings and states that existed on paper.

A gate that could not run rendered as a pass

The assertion gates return neutral() when they can't run, and docs/features/merge-gates.md says:

a check that could not run must never read as one that succeeded

But GateResult had only passed, and neutral() set it to true:

function neutral(name: string, summary: string): GateResult {
  return { name, mode: 'warning', passed: true, summary, detail: 'This check did not run.' }
}

So a skipped gate got the same ✅ as one that ran and found nothing, and a check run made entirely of skipped gates was titled "All checks passed" and concluded success.

GateResult gains neutral. A skipped gate renders ⏭️ in the check run and the terminal, is counted apart in the title ("1 check(s) passed, 1 did not run"), and a run of nothing but skipped gates concludes neutral — the "no checks configured" outcome, arrived at a different way. A skipped gate still never blocks.

maxAttempts ran exactly once

Declared on ai.majorUpgrades, documented as "maximum agent attempts per upgrade", never read. Now: a run that stops short — max_tool_calls, timeout, error — is handed its own output and told to continue from the workspace as it stands, up to the limit. Starting over would redo the work that did land.

Unset means one attempt, as before. The outcome records how many it took. The runner is injectable, so the loop is tested without a model.

Not in this PR

ReviewSubmissionResult.inlineComments being dropped — that touches the same lines as #1431's reviewPullRequest refactor and would conflict, so it follows once #1431 lands.

Tests

2153 → 2164.

Lint ✓ · typecheck ✓ · check:docs ✓ · 0 fail

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