Delete the routine draft/review state machine (CL-7375)

[TheGreatAxios]

Resolves CL-7375

Hard cutover, no shims: deletes the free-text describe-to-agent routine drafting flow. Myra creates and retargets routines only through GET .../workflows/targets → routine_create/routine_update (@corbits/routines-tools), the same tool-call surface a person's own request goes through — there was never a second, review-first path.

Deleted

• packages/routines/src/drafts.ts, myra-drafting.ts, suggest-name.ts and their tests, plus packages/routines/test/routine-drafts.test.ts
• routine_draft Drizzle schema (packages/routines/src/schema.ts)
• /routine-drafts* routes (create/list/get/approve/discard) in packages/routines/src/routes.ts
• Draft wire types/paths (RoutineDraft, DraftedStep, CreateDraftInput, routineDraftsPath family, suggestRoutineNameFromPrompt) in packages/routines/src/client.ts
• Draft wiring in apps/hub/src/index.ts: routineDraftStore, listAutomatableWorkflowsForDraftInventory, routineDraftingCryptoProviders, the drafts/drafting deps passed to createRoutineRoutes
• createRoutineDraft/listRoutineDrafts/approveRoutineDraft/discardRoutineDraft in apps/web/src/routines-api.ts (no UI surface ever called them)
• validateTriggerFieldsInput in packages/workflow-catalog/src/index.ts — its only caller was the deleted myra-drafting.ts

Added

• 0007_drop_routine_draft migration (packages/routines/src/migrations.ts) — drops the routine_draft table. Every earlier migration that mentions routine_draft (including CL-7350's 0006, which backfills routine_draft.approved_routine_id/definition_asset_id) is left untouched as the historical record.

Retained (verified still live)

• resolve-myra-definition-id.ts (@corbits/agent-directory) — still used by agent-definition drafting (apps/hub/src/index.ts:3364 area)
• listMyraConversationalAgents — shared with agent-definition drafting's inventory
• @corbits/agent-directory's own drafting (agent-definition-drafting.ts, agent-definition-draft-routes.ts) — unrelated feature, not routine drafts

Docs

• docs/workflow-model.md — new "Deleted in CL-7375" section
• packages/routines/README.md — "Key modules" list updated, notes the routine_targets → routine_create/routine_update creation path

Verification

• bun run typecheck — clean
• bun test packages/routines packages/routines-tools apps/web/test/routine* — 394 pass, 0 fail (routines/-tools run with DATABASE_URL for the DB-gated migration/store/targets suites, including the new 0007 drop and the updated 0006 backfill test)
• bun run check:browser-safe-subpaths — clean
• bun run scripts/checks/report-error.ts --write-baseline — diff removes exactly one stale line (the deleted drafting route in routes.ts)
• bun run scripts/checks/no-product-tenancy.ts — updated the routines schema's expected table list, still passes

This PR sits at the top of the routines/workflow-model stack (based on cl-7366-e2e-proof) so it can be dropped independently if the draft flow needs to stay.