w694: delegated requests let workers merge obvious-bug and tests-only PRs

[bryding]

Request: w694

The constraints every standing-agent delegation adds (delegationConstraints, server/orchestrators.ts) told the worker "do not merge it yourself: a person's merge is the review of an agent's request". w687, w688 and w689 (the nightly regression sentry's auto-approved checks; game PRs #1252, #1254, #1255) held green PRs for hours.

What changed

• The hold is gone. Per Ben (2026-10-08, "as long as they were obvious bugs merging is fine from sentry investigations") the text now says: merge your own PR into develop on green CI and verification when it fixes a clear, demonstrated bug (failing-first test or reproduction) or only adds tests or verdicts; a PR that changes design or behaviour beyond the bug is a judgement call, left open for a person and said so in the report.
• Kept: PR into develop, never master/main, never push to develop directly, never force-push; money, publishing, live settings, releases and deploys still need a person in their own words.
• Why the guard existed: an agent's task text may come from outside the team. It covered auto-approved delegations too (the failing case), so it cannot be kept "only for unapproved ones"; the narrowing to obvious bugs is Ben's.
• Dispatcher and orchestrator prompts already say workers merge their own PRs (MERGE_RULES, server/agents.ts); they do not repeat the delegation hold, so nothing to align there. Docs updated: docs/orchestrators.md, docs/standing-agents.md, CHANGELOG.

Tests

• New w694: a delegated request lets its worker merge a clear bug fix... (both cases, no blanket ban, person-only gates kept); the w527 end-to-end test now asserts the worker's brief carries the new text.
• tsc -p . clean; server/orchestrators.test.ts 61/61. Full npm test: 1183/1185; the 2 failures differ between runs and the unchanged base also fails 2 other timing tests under load (flaky, not this change).

Needs a portal deploy (not done here).

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