[DIC-17] coherence-scan --emit-followup: wire DIC-26 monitor → DIC-17 follow-up bridge

[an0mium]

Summary

• Adds --emit-followup flag to aragora coherence-scan (DIC-26 CLI surface) that surfaces DIC-17 FollowupProposal objects for every error-severity coherence issue in the scanned belief ledger.
• Exports propose_followup_for_coherence_issue from aragora.epistemic package API (was in followup.__all__ but missing from the package-level __init__.py).
• 10 focused tests covering flag-gating, text/JSON output, warning-only no-proposal behaviour, and the boss-ready-exclusion queue-governance invariant.

Type of Change

• New feature (non-breaking change that adds functionality)
• Test improvement

Related Issues

Related to #6027 (DIC-17 — failed-claim / open-crux follow-up bridge)
Related to #6220 (DIC-26 — belief coherence monitor)

Checklist

Before Submitting

• My code follows the project's code style (ruff clean, mypy clean on touched modules)
• I have added tests that prove my fix/feature works
• All new and existing tests pass (tests/cli/test_dic26_coherence{,_followup}.py, tests/epistemic/test_coherence*.py — 41 tests passing)
• My commit messages follow conventional commit format

Code Quality

• New code has type hints
• No hardcoded secrets or credentials
• Error handling is appropriate

For New Features

• Feature is tested with unit tests
• Feature integrates with existing systems appropriately

Test Plan

# All 10 new CLI tests + 31 existing coherence + followup tests
pytest tests/cli/test_dic26_coherence_followup.py tests/cli/test_dic26_coherence.py tests/epistemic/test_coherence_followup_bridge.py tests/epistemic/test_coherence.py -v
# → 41 passed

# Smoke: package-level export
python3 -c "from aragora.epistemic import propose_followup_for_coherence_issue; print('OK')"

Additional Notes

Flag gating: both ARAGORA_COHERENCE_MONITOR_ENABLED=1 and ARAGORA_EPISTEMIC_FOLLOWUP_ENABLED=1 must be set for proposals to flow. Default is OFF. Live queue effect: none — read-only operator surface.

Queue governance: boss-ready label is never applied to generated proposals (tested explicitly). Proposals are DIC-17 planning-truth output only; the proof-first Foreman gate controls promotion.

Net diff: 273 LOC (61 modified, 212 new test lines). No changes to scripts/, dispatch, boss loop, or swarm supervisor.

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