Drive the staged in-tree YAML formatter rollout — implement the rule-based style spec, cross-validate against pretty_yaml, joint parser+formatter cutover, then hashpipe extension. Sibling to yaml-shadow-expand (parser-coverage); invoke when the work is formatter-side or the joint cutover gate.
Guard Panache's YAML shadow parser coverage — yaml-test-suite parity, allowlist nibbling, triage regen, and parser-side cluster fixes. Sibling to yaml-formatter-cutover (which owns the in-tree formatter rollout and joint cutover); invoke this one when the work is parser-coverage or test-suite triage.
Incrementally make Panache's CST shape for HTML-block /
Incrementally migrate Panache's Pandoc-dialect inline parsing onto the unified inline IR (currently CommonMark-only) one bounded sub-task at a time, verifying every CST divergence against pandoc-native before fixing or deferring.
Triage and fix panache smoke-test regressions (idempotency, losslessness, parse/format checks) from CI debug-format reports and linked issues.
Profile-driven performance work on the panache parser or formatter. Measure first with perf + the right harness; classify hotspots into one of a small set of buckets; apply the matching cheap fix; verify median wall-time moved before committing.
Add a new built-in lint rule to the Panache linter — wire it into the registry, gate it on the right extension/flavor, add a regression fixture with focused assertions, and document it.