Collapse steering issue + experiment log into a single program issue

[Copilot]

Autoloop currently spawns up to three issues per program (program issue, steering issue, monthly experiment log). In practice the split is noise: steering issues sit empty and get auto-closed as stale, monthly logs clutter the tracker, and per-iteration activity bypasses the issue users actually subscribe to. This collapses everything into one [Autoloop: {program-name}] issue per program.

Changes

• workflows/autoloop.md (source of truth)
  • Replaced ## Steering Issue and ## Issue-Based Program Updates with a single ## Program Issue section covering: auto-creation for file-based programs, the in-place status comment (<!-- AUTOLOOP:STATUS -->), per-iteration comments, and human steering via plain prose comments.
  • Removed the file-based vs issue-based asymmetry — all programs follow the same flow. Step 5 (accept/reject/error) and Halting Condition no longer branch on selected_issue.
  • Renamed state-file field Steering Issue → Issue in the template, Program Info block, and Machine State field-reference table.
  • Dropped the Steering Issue row from the status comment table; added a Paused indicator.
  • Added a Migration subsection for existing installations (adopt existing [Autoloop: {name}] issue if present; legacy Steering Issue field copied into Issue).
• .github/workflows/autoloop.md — synced markdown body from source. Pre-step (PYEOF heredoc) untouched.
• AGENTS.md — rewrote the conventions bullets to describe the unified program issue.

Notes

• safe-outputs.create-issue.max was already 1 in both files; no change needed.
• The scheduler JS heredoc was not modified; all 100 existing tests pass. The parseMachineState parser is field-agnostic so both legacy Steering Issue and new Issue rows continue to deserialize.
• One create-issue call per run remains: bootstrapping a file-based program's issue on first run.

[mrjf]

@copilot fix tests

[Copilot]

@copilot fix tests

CI was failing on TestSyncBranchesCredentialOrdering::test_lock_creds_before_merge with ModuleNotFoundError: No module named 'yaml' (pre-existing — tests.yml only installed pytest, but that test imports yaml). Added pyyaml to the install step in .github/workflows/tests.yml. All 100 tests now pass locally. — 519ada7