Add routine revision history and restore flow (#5285)

## Thinking Path

> - Paperclip is the control plane for autonomous AI companies.
> - Routines are the scheduled/recurring work surface that keeps a
company operating without manual kicks.
> - Operators need routine edits to be auditable and recoverable,
especially when routines control assignments, prompts, triggers, and
webhook secrets.
> - Documents already have revision-style safety, but routines did not
have equivalent history or restore semantics.
> - This pull request adds append-only routine revisions across the
database, shared contracts, server routes, and board UI.
> - The benefit is safer routine iteration: users can inspect history,
compare changes, restore older definitions, and avoid overwriting newer
edits.

## What Changed

- Added `routine_revisions` storage, latest revision pointers on
routines, shared types, validators, and API docs for routine revision
history.
- Added server service/route support for listing routine revisions,
conflict-aware routine saves, and append-only restore operations.
- Added a History tab on routine detail with revision preview,
structured change summaries, description line diffs, dirty-edit
blocking, restore confirmation, and restored webhook secret surfacing.
- Extracted the line diff helper from `DocumentDiffModal` into
`ui/src/lib/line-diff.ts` for reuse.
- Rebased the branch onto current `public-gh/master` and renumbered the
routine revision migration to `0077_unusual_karnak` after upstream
`0076_useful_elektra`.
- Made the `0077` routine revision migration idempotent so installs that
already applied the branch-local `0076_unusual_karnak` can safely
advance.
- Updated the plugin SDK test harness routine fixture with the new
revision fields required by the shared `Routine` contract.

## Verification

- `pnpm --filter @paperclipai/db run check:migrations` passed.
- `pnpm exec vitest run --project @paperclipai/shared
packages/shared/src/validators/routine.test.ts` passed.
- `pnpm exec vitest run --project @paperclipai/ui
ui/src/lib/line-diff.test.ts
ui/src/components/RoutineHistoryTab.test.tsx
ui/src/lib/workspace-routines.test.ts ui/src/pages/Routines.test.tsx`
passed.
- `pnpm exec vitest run --project @paperclipai/server
server/src/__tests__/routines-service.test.ts --pool=forks
--poolOptions.forks.isolate=true` passed.
- `pnpm exec vitest run --project @paperclipai/server
server/src/__tests__/routines-routes.test.ts --pool=forks
--poolOptions.forks.isolate=true` passed.
- `pnpm --filter @paperclipai/plugin-sdk typecheck` passed after
updating the SDK test harness fixture.
- `pnpm --filter @paperclipai/plugin-sdk build` passed; this refreshed
local generated SDK output needed by plugin example typechecks.
- `pnpm -r typecheck` passed.

## Risks

- Medium migration risk: this adds routine revision storage and
backfills existing routines. The migration is ordered after upstream
`0076` and uses `IF NOT EXISTS` / duplicate-object guards to tolerate
earlier branch-local migration application.
- Restore behavior intentionally appends a new revision instead of
mutating history; callers expecting an in-place rollback need to follow
the new latest revision pointer.
- Restoring webhook triggers recreates webhook secret material, so users
must copy newly surfaced secrets after restore.
- Conflict-aware saves now reject stale routine edits when the client
sends an older `baseRevisionId`.

> For core feature work, check [`ROADMAP.md`](ROADMAP.md) first and
discuss it in `#dev` before opening the PR. Feature PRs that overlap
with planned core work may need to be redirected — check the roadmap
first. See `CONTRIBUTING.md`.

## Model Used

- OpenAI Codex, GPT-5-based coding agent, with shell/tool use in a local
git worktree. Exact context-window size is not exposed in this runtime.

## Checklist

- [x] I have included a thinking path that traces from project context
to this change
- [x] I have specified the model used (with version and capability
details)
- [x] I have checked ROADMAP.md and confirmed this PR does not duplicate
planned core work
- [x] I have run tests locally and they pass
- [x] I have added or updated tests where applicable
- [x] If this change affects the UI, I have included before/after
screenshots
- [x] I have updated relevant documentation to reflect my changes
- [x] I have considered and documented any risks above
- [x] I will address all Greptile and reviewer comments before
requesting merge

Screenshots: not attached in this draft PR; the new UI flow is covered
by component tests listed above.

---------

Co-authored-by: Paperclip <noreply@paperclip.ing>

docs/api/routines.md

@@ -75,11 +75,28 @@ Fields:
 ```
 PATCH /api/routines/{routineId}
 {
-  "status": "paused"
+  "status": "paused",
+  "baseRevisionId": "{latestRevisionId}"
 }
 ```
 
-All fields from create are updatable. **Agents can only update routines assigned to themselves and cannot reassign a routine to another agent.**
+All fields from create are updatable. `baseRevisionId` is optional for backward compatibility; when provided, stale values return `409 Conflict` with the current revision id. **Agents can only update routines assigned to themselves and cannot reassign a routine to another agent.**
+
+## List Revisions
+
+```
+GET /api/routines/{routineId}/revisions
+```
+
+Returns append-only routine definition revisions newest first. Snapshots include routine fields and safe trigger metadata only; webhook secret values and `secretId` are never returned.
+
+## Restore Revision
+
+```
+POST /api/routines/{routineId}/revisions/{revisionId}/restore
+```
+
+Restores a historical routine definition by creating a new latest revision copied from the selected revision. Historical revision rows, routine run history, and activity history are preserved. If restoring a deleted webhook trigger requires recreating it, the response can include one-time replacement secret material for that trigger.
 
 ## Add Trigger