feat(contract): lanes run gstack-pregate (and the sealed guard where configured) before done; handoff carries the gstack trailer and PREGATE: line

The coordinator contract gains a 'Before done' paragraph and the handoff
order GSTACK_RESULT, gstack: ok|fail <rev>, PREGATE:, gate summary; the
spec section is regenerated and docs/unattended.md states the same rule.
A new test pins the terms and their order; the byte-identity pins stay.

Co-authored-by: capy-ai[bot] <230910855+capy-ai[bot]@users.noreply.github.com>
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garrytanandcapy-ai[bot] committed 2026-10-13 01:19:22 +00:00
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@@ -19,4 +19,6 @@ Behavior-change notices. Every user-visible behavior change outside the plan's o
Spend caps. Each lane runs under the \`--spend-cap\` the coordinator names; a lane that reaches it stops with \`status=budget_exhausted\` and reports spent, reserved and unknown charges. Paid evals are never retried to change a verdict; a rerun needs a named repair. Host-subagent spend is reported as \`unknown\`, never zero.
Handoff format. A lane reports in this order, identifiers first: PR URL (or \`no PR\` with branch and SHA), \`GSTACK_RESULT\` line, gate summary (lanes passed/failed/skipped), behavior changes (or \`none\`), spend (spent/reserved/unknown), then what it could not verify. Full thread ids (\`jam_…\`), never short codes, in every cross-thread message. Prose after the identifiers may be truncated; nothing before them may be.`;
Before done. A lane runs \`gstack-pregate run --allow-repo-commands\` on its branch (the unit tier on the changed files plus the repo's guards) and reports done only after it passes. In a repo whose \`.gstack/pregate.json\` has a \`sealed\` key, it runs \`gstack-pregate sealed\` before any push or PR creation; a refusal stops the push, because a PR tool may not run local hooks.
Handoff format. A lane reports in this order, identifiers first: PR URL (or \`no PR\` with branch and SHA), \`GSTACK_RESULT\` line, the \`gstack: ok|fail <rev>\` line, the \`PREGATE:\` line, gate summary (lanes passed/failed/skipped), behavior changes (or \`none\`), spend (spent/reserved/unknown), then what it could not verify. Full thread ids (\`jam_…\`), never short codes, in every cross-thread message. Prose after the identifiers may be truncated; nothing before them may be.`;