[danbarua]

Problem

• packages/core-agent: this old agent runtime is not used. The VS Code extension runs labkit-effect's agent and imported only two logging helpers from it.
• The landing view: the app started at the API's root list of workspaces (/collections/workspace). A picked workspace was carried in ?list= until a record opened.
• File Explorer: a file opened from the graph or a link was not shown in File Explorer when its folder was closed.
• The filter box: the Items pane's filter took a row of its own all the time, and File Explorer and Source Explorer had no filter.

Change

core-agent deleted

• diagnosticError and redactDiagnostics move into packages/app-vscode/src/utils/redact.ts, with their test. The extension still builds (bun run build in packages/app-vscode).
• docs/agent/ was core-agent's guidance and is deleted too, except the note on what ACP's messages mean, now docs/acp-language.md.
• CLAUDE.md, the root package.json (test:agent), the PR labeler, the comment-length check's exemptions and the layering-rule baseline no longer name it.

File Explorer follows the open file. When a file in the tree opens from anywhere else, such as the graph or a link, the folders above it open, so its row and the box show. A folder closed afterwards stays closed until another file below it opens (foldersAbove in explorers.tsx).

Filters behind a search button

• Items, File Explorer and Source Explorer each have a borderless search button at the right of the list's header. The filter box shows only after the button is pressed.
• Hiding the box, by the button or by Escape, empties it, so a hidden filter never narrows a list.
• File Explorer's filter searches every committed path (/paths), so it finds a file in a folder not yet opened, and lists the matches with their folders. At most 200 are drawn, and a line says how many match out of how many files.
• /paths link template. The listing now links each path's file with an RFC 6570 template, file: { href: ".../file/{+path}", templated: true }, so the page opens a match without building the address itself.
• Source Explorer's filter narrows the commits loaded so far by id, message, author or branch, without their lanes. It says how many of the loaded commits match, and when more can be loaded.

Workspace-scoped app

• API. GET /workspace lists the workspaces, each addressed by its own index, with no index above it. /collections/workspace stays for other API clients.
• Landing view. The app starts at a list of workspaces read from /workspace. A request test checks that the landing view asks for nothing under /collections.
• Picking a workspace opens /app/workspace/<slug>.
• Record Explorer.
  • In a workspace it lists the workspace's collections, and below them the collection picked (?list=).
  • ?list= is left out when it would name the workspace's own collections.
  • With no workspace it is disabled, and says "Pick a workspace to browse its records."
• Old addresses. An address that names its workspace only in ?list=, such as /app/?list=/workspace/alpha/question, is rewritten to /app/workspace/alpha?list=/workspace/alpha/question.
• Dev server proxy. The API path pattern now also matches /workspace followed by a query.

Controls

• Source Explorer's filter searches only the commits loaded so far, and says so.
• File Explorer's matches have the plain file icon: the path list names no media type, and the page maps no extensions.
• A workspace's own page shows the graph card, empty until a record opens, and the note "Pick a collection in Record Explorer, then an item, to open it here."
• Test count. The suite drops from 1557 to 1104 tests, because core-agent's own tests went with it.

Verification

• bun run check: exit 0, 1104 pass, 0 fail.
• bun run e2e with E2E_PORT_API=9019 E2E_PORT_DEV=8970 E2E_PORT_BUILT=8971: 173 passed, 11 skipped (the dev-only tests, in the built bundle).
• bun run build in packages/app-vscode: built extension.cjs.
• Unit tests:
  • tests/file-tree.test.ts: the folders above a file, and none outside the tree.
  • tests/api.test.ts: /workspace and /workspace/ list alpha and beta, with no index link.
  • tests/git-api.test.ts: /paths links its file template.
  • packages/app-vscode/src/utils/redact.test.ts: the redaction test, moved from core-agent.
• e2e, new or changed:
  • The root lands on the workspace list, Record Explorer is disabled, and no request goes to /collections.
  • Clicking alpha, then Question, then Q_1 opens each in turn.
  • The two old ?list= addresses are rewritten to their path forms.
  • Opening notes/plan.md from a link opens notes in File Explorer and marks the row.
  • The Items filter is hidden until its button. It narrows the list to Q_2, and Escape hides and empties it.
  • File Explorer's filter for "plan" lists notes/plan.md, which was not loaded, as 1 match, and opens it.
  • Source Explorer's filter for "side work" leaves the commit "Side work", and says how many loaded commits it searched.

Linked issues

None. This follows #672.

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