feat(scoping): promotion routes through first-phase choice + bridge

[leeovery]

Summary

• The quick-fix promote paths predate discovery by two months and never picked up its routing: promoted features were forced straight into discussion (no research option), and both promotions invoked the phase entry skill directly inside the still-loaded scoping session.
• Feature promotion now presents the same research-vs-discussion choice discovery's first-phase-routing.md gives a fresh feature; bugfix promotion sets next_phase = investigation.
• Both hand off via the workflow-bridge context block (Completed phase: discovery — the supplied-destination arm, no state derivation), mirroring conclude-discovery.md's B. Bridge shape, so the first phase starts in a clean context.

Test plan

• Conventions lint green (27 checks).

🤖 Generated with Claude Code

Stack

1. feat(engine): discovery-map add-batch — the harvest persists in one call (D7) #505
2. feat(engine): manifest apply — batched set/delete across one work unit (D7) #506
3. refactor(prose): task-map family folds onto existing batch forms (D7, stage 3) #507
4. feat(engine): manifest set — two grammars, never mixed #508
5. refactor(prose): dump/read folds — subtree gets replace per-topic loops (D7, stage 5) #509
6. feat(engine): commit --plan — plan storage stages from recorded state (D7, stage 6) #510
7. fix: batching-stack review round — re-resolve rewired, guards symmetric, hardening pinned #512
8. fix: deep-dive round 2 — backbone rule flipped, pre-upgrade paths routed, flow bugs closed #513
9. fix(review-r3): engine hardening + crash-resume seams #514
10. feat(scoping): promotion routes through first-phase choice + bridge #515 👈 current
11. fix(spec): pin the bugfix source name to the topic #516
12. fix(skills): gate-skip sentence accurate in gate-less phases #517
13. fix(review-entry): name the real upstream — specification and plan #518
14. fix(shared): strip triage-landing's unreachable superseded-research arm #519
15. feat(engine): refuse work-unit-level fields that shadow the phases tree #520
16. fix(discovery): first-written briefs join the full brief lifecycle #521
17. test(sim): pipeline simulation — engine driven end-to-end as a black box #522
18. fix(round-4): review findings — backfill keying, ratchet evasion, pull guard #523