feat(init): Plan 22 Phase 2 — initflow package + Chromeless harness hook

[LastStep]

Summary

Phase 2 of Plan 22 (bonsai init cinematic redesign) — adds internal/tui/initflow/ package with chrome/enso/stage/fallback primitives, a Chromeless optional capability on the harness, and an env-flag branch in cmd/init.go routing to a stub runInitRedesign. Legacy bonsai init flow unchanged; new path runs only under BONSAI_REDESIGN=1 and renders empty stage scaffolds.

Changes

• internal/tui/harness/harness.go — Chromeless optional interface + short-circuit in View().
• internal/tui/harness/harness_test.go — coverage for chromeless render path.
• internal/tui/initflow/fallback.go — WideCharSafe() + StageLabel.
• internal/tui/initflow/fallback_test.go — tests.
• internal/tui/initflow/enso.go — RenderEnsoRail.
• internal/tui/initflow/chrome.go — RenderHeader, RenderFooter, KeyHint.
• internal/tui/initflow/stage.go — Stage base + renderFrame.
• internal/tui/initflow/stub.go — StubStage used by Phase 2's four placeholder stages.
• cmd/init.go — env-flag branch.
• cmd/init_redesign.go — stub runInitRedesign with 4 placeholder stages.
• go.mod — promotes mattn/go-runewidth from indirect to direct (now imported by initflow/fallback.go).

Plan

station/Playbook/Plans/Active/22-init-redesign.md — Phase 2.

Verification

• make build
• go test ./...
• gofmt -s -l . clean
• go vet ./... clean
• bonsai init (no env) runs legacy flow unchanged.
• BONSAI_REDESIGN=1 bonsai init renders 4-stage chrome; Enter cycles; Esc pops; Ctrl-C aborts cleanly.
• BONSAI_ASCII_ONLY=1 BONSAI_REDESIGN=1 bonsai init uses ASCII rail.
• Ctrl-C with no env flag / with redesign env leaves no .bonsai.yaml in tmpdir.

Snapshot (120 × 32)

Redesign — stage 2 (Branches), wide-char safe:

[盆] BONSAI · INITIALIZE · v0.2.0                                                                        PLANTING INTO
                                                                                  /Users/dev/code/voyager-api/station/

  ●────────────────────────────────────●────────────────────────────────────[枝]────────────────────────────────────○
VESSEL                               SOIL                                 BRANCHES                               OBSERVE
                                                                             えだ

  (stage body goes here)



 一 BONSAI 一                                                                   ↵ continue  ·  esc back  ·  ctrl-c quit

Redesign — stage 2 (Branches), ASCII fallback (BONSAI_ASCII_ONLY=1):

[o] BONSAI · INITIALIZE · v0.2.0                                                                         PLANTING INTO
                                                                                  /Users/dev/code/voyager-api/station/

  [x]──────────────────────────────────[x]──────────────────────────────────[3]──────────────────────────────────[ ]
VESSEL                                SOIL                               BRANCHES                              OBSERVE

  (stage body goes here)



 一 BONSAI 一                                                                   ↵ continue  ·  esc back  ·  ctrl-c quit

Live tmux smoke test — first stage of redesign (VESSEL), wide-char:

[盆] BONSAI · INITIALIZE                                                                                 PLANTING INTO
                                                                                              /tmp/t-redesign/station/

  [器]────────────────────────────────────○────────────────────────────────────○────────────────────────────────────○
 VESSEL                                 SOIL                               BRANCHES                              OBSERVE
   うつわ

  (stage body goes here)



 一 BONSAI 一                                                                                ↵ continue  ·  ctrl-c quit

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