Day 3b complete: Android worker finishes the three-platform pipeline

[dadachi]

Summary

Closes Day 3b. Three workers now run end-to-end in parallel against real substrates.

• src/agents/workers/android.ts — real implementation. Copies \$NATEMPLATE_ANDROID → ./out/<slug>/android, runs rename.rb, git init -q -b main.
• scripts/ruby/rename.rb:
  • TEXT_EXTS += .kt .kts .xml .gradle .pro .toml .properties .cfg
  • TEXT_BASENAMES += gradlew gradlew.bat gradle.properties local.properties
  • SKIP_DIR_SEGMENTS += build .gradle .idea .kotlin captures

Tricky bit worth flagging

Android has nested build/ dirs in every module (app/build, model/build, datastore-proto/build). The Rails/iOS worker's startsWith("/build/") path-prefix skip would miss those and copy ~hundreds of MB of KSP/Hilt generated files into ./out/. Switched Android's filter to segment-based skip — rel.split("/").some(seg => SKIP_SEGMENTS.has(seg)). Catches build anywhere in the path.

Verified end-to-end (both specs, both operation paths)

Real planner (claude-opus-4-7, ~5s/$0.08) + all three real workers in parallel (~1s each via Promise.all):

Spec	Platform	Files scanned	Content changes	Substitutions	File renames	Leftovers
clinic-queue (adapt)	rails	305	134	2,459	49	0
	ios	252	101	2,227	44	0
	android	271	116	1,854	49	0
task-tracker (replace)	rails	305	139	3,110	65	0
	ios	252	120	2,950	77	0
	android	271	131	2,828	89	0

Leftover audit = grep -rln for [Ss]hop, [Ss]hopkeeper, ItemTag across *.rb .swift .kt .xml .kts .pbxproj .gradle .pro — empty in all cases.

Spot checks (clinic-queue/android):

• model/src/main/kotlin/.../model/Clinic.kt — exists (was Shop.kt)
• data/clinic/ClinicApi.kt — dir AND file renamed in one pass
• No generated files under output build/ dirs (copy filter working)

What remains

• Day 4: reviewer sub-agent (OpenAPI contract diff), any planner prompt refinement if workers need more structure.
• Day 5 Layer 2: actual bin/dev / xcodebuild / ./gradlew assembleDebug verification. Compile errors will surface real semantic issues (e.g., acts_as_tenant wiring, Hilt module registration) that lexical renaming can't fix.

Test plan

• npm run ci — 5/5 under stub mode
• clinic-queue spec, real planner + all 3 real workers — zero leftovers, all three parallel wall-time ~1s
• task-tracker spec, real planner + all 3 real workers — zero leftovers across all platforms
• Segment-skip verified on Android: find out/clinic-queue/android -path '*/build/*' | wc -l returns 0
• Full build verification — Day 5 Layer 2