feat(engine): selection projection + bridge continuation surfaces

[leeovery]

Stage 4 of the render-surfaces programme (design log: #489; base: #492) — where the programme meets the clone-family ledger item.

Selection: one projection, five consumers

projections/selection.cjs renders the continue-* pick list — numbered display with phase sub-rows (active phases for epics, titlecaseLabel phase labels otherwise, promoted from start.cjs to conventions), conditional view-completed option, manage option. Each navigation gateway's index dump appends the DISPLAY: selection / MENU: selection sections (deferred — emitted only at the select step per their markers), and all five select-*.md references drop their @foreach templates for two lines of section emission.

Bridge continuations: five work-unit-addressed surfaces

pipeline-complete (body varies by work_type and --skipped-review), phase-completed, early-completion-gate, revisit-gate, epic-all-done-gate. The four non-epic continuation references — structurally identical clones — now differ only in their pipeline-description prose; epic's all-done gate, completed display, and phase-completed line all render from the engine. Work-unit addressing (bare <wu>, type from the manifest) joins the address grammar.

Test plan

• Hand-written selection goldens (byte-exact bugfix variant, epic variant, empty/unknown), five bridge-surface tests, addressing validation.
• The five gateway index pins extended with the selection sections — spliced from live output only after the hand-written projection goldens verified the shape (and after one UTF-8 mojibake round the pins caught).
• npm test — 1502/1502. Typecheck + conventions lint clean.

🤖 Generated with Claude Code

Stack

1. feat(engine): discovery-map add-batch + cache purge at close (D7 one-call) #495
2. feat(engine): render surface catalogue — resume-gate and task-list pilots #490
3. feat(engine): finding + findings-summary surfaces — review-findings loop unified #491
4. feat(engine): task-gate surfaces — proposed-task, tasks-overview, author-task-gate, phase-tree #492
5. feat(engine): selection projection + bridge continuation surfaces #493 👈 current
6. feat(engine): transaction confirmation sections — lifecycle verbs carry their own chrome #496
7. feat(engine): entry-gate + phase-note — entry validation derives engine-side #497
8. feat(engine): the fence is the frame — boxedFrame retired (D8) #498
9. feat(engine): topic complete + discovery-session close fold their kb warnings (7a) #499
10. feat(engine): resume-gate variants + entry-gate --own + phase-completed --paths (7b) #500
11. test(conventions): templated-fence ratchet — check 13 lands D4 (7c) #501