Replaces the labels-as-milestones pattern (carried over from the retired SQLite
milestone subsystem) with pql's native initiative/epic hierarchy, which already
modelled this: initiative T-745 (Development Cascade) holds the six phases as epics.
A ticket is in a phase by being parented under that phase epic — self-maintaining,
no label to apply or forget.
The `phase:4` label had already drifted (66 tickets under the Phase-4 epic T-750 but
only 42 labelled). Fixes:
- T-750 (Phase 4) -> in_progress to mark the active phase (sequential per D-166).
- Re-parented the 2 strays (T-974 Atlas-to-tile epic, T-1008 economy task) under T-750.
- Dropped all 42 phase:4 labels (tombstoned in the changelog).
- /whats-next, /ticket, ticket-cli.md, CLAUDE.md now gate on
`pql ticket list --under <active-phase-epic> --unblocked` instead of `--label phase:4`.
- Fixed the label-action verb in the docs: pql uses `add|rm`, not `add|remove`.
- pql-requirements #9 flipped: no milestone entity / labels-as-milestones needed — the
initiative/epic tree is the answer.
Verified: `pql plan rebuild` reconstructs the mutations; `--under T-750 --unblocked`
returns the active phase's ready work.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
jpmschweitzerandClaude Opus 4.8
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