refactor: package code organization wave 13

[gsxdsm]

Summary

Wave 13 of package code organization (stacks on #2362 / wave 12).

Peels

New module	Parent
app/api/planning.ts	planning mode + agent onboarding streams
app/api/dev-server.ts	dev-server detect/session/log/preview client
app/api/mission-interview.ts	mission / milestone / slice interview streams
app/api/models-usage.ts	models registry + usage
app/api/task-steer.ts	steer / spec revise / rebuild / refine
app/api/ai-summarize.ts	AI title summarization
task-store/task-artifacts-ops.ts	rename of remaining-ops-7

Public paths stay stable via legacy.ts re-exports (app/api.ts → legacy).

LOC

• legacy.ts ~3342 → ~1408 (under the 2000-line hard cap; removed from grandfather baseline)

Shims

• legacy.ts → peels above (delete-when: dashboard imports domain modules)
• remaining-ops-7 → task-artifacts-ops (rename complete)

Test plan

• eslint on peeled API modules + legacy
• dashboard app typecheck (wave13-related errors cleared)
• core typecheck
• pnpm check:line-count (baseline updated)
• CI merge gate

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[greptile-apps]

Greptile Summary

This PR reorganizes package code while keeping existing public API paths stable. The main changes are:

• Moves dashboard planning and onboarding APIs into a focused module.
• Moves dev-server and interview APIs into focused modules.
• Moves model usage, task steering, and title summarization into focused modules.
• Preserves dashboard imports through the legacy API barrel.
• Renames the core task artifact operations module and updates its importers.
• Updates the line-count baseline.

Confidence Score: 5/5

This looks safe to merge.

• The core rename preserves the imported symbol set.
• The dashboard barrel keeps the existing public import paths.
• No blocking issue tied to the eligible follow-up scope was found.

Important Files Changed

Filename	Overview
packages/dashboard/app/api/legacy.ts	Replaces inline implementations with value and type re-exports from the focused API modules.
packages/dashboard/app/api/dev-server.ts	Contains the extracted dev-server detection, lifecycle, logging, preview, and session APIs.
packages/dashboard/app/api/planning.ts	Contains the extracted planning and agent-onboarding request and stream APIs.
packages/dashboard/app/api/mission-interview.ts	Contains the extracted mission, milestone, and slice interview APIs.
packages/dashboard/app/api/models-usage.ts	Contains the extracted model registry and provider usage APIs.
packages/dashboard/app/api/task-steer.ts	Contains the extracted task steering, specification revision, rebuild, and refinement APIs.
packages/dashboard/app/api/ai-summarize.ts	Contains the extracted AI title summarization client.
packages/core/src/task-store/task-artifacts-ops.ts	Renames the task-store operations module while retaining its implementation.
packages/core/src/store.ts	Updates the store to import task artifact operations from the renamed module.

_{Reviews (3): Last reviewed commit: "merge: wave12 into wave13 after main boo..." | Re-trigger Greptile}