[Bugfix #1169] Collapse Pull Requests / Recently Closed / Team / Status sidebar views by default

[amrmelsayed]

Summary

Adds "visibility": "collapsed" to four lower-priority Codev VS Code sidebar views so they render as ~22px headers on first install instead of fully expanded. Reclaims vertical space for the primary workload surfaces (Workspace, Agents, Backlog).

Root Cause

In packages/vscode/package.json, all seven contributes.views.codev[] entries omitted "visibility", so VS Code applied its default (visible). VS Code exposes no manifest lever for view height ratios, so the only way to bias the first-render distribution toward the primary surfaces is defaulting lower-priority views to collapsed.

Fix

Added "visibility": "collapsed" to the four lower-priority views, preserving each existing when clause:

• codev.pullRequests (Pull Requests)
• codev.recentlyClosed (Recently Closed)
• codev.team (Team)
• codev.status (Status)

Workspace, Agents, and Backlog stay expanded. Uses collapsed (not hideByDefault) so discoverability is preserved: the header row stays visible, one click to expand. Follows the existing precedent set by codev.placeholder in the codevPanel container.

Scope discipline: manifest + test only, no source changes. Release-notes entries (CHANGELOG.md [Unreleased] + docs/releases/UNRELEASED.md Polish) are handled on the repo's dedicated docs/vscode-changelog branch per the established dual-accumulate workflow, not on this code branch.

Caveat for existing users

visibility: "collapsed" only applies to first-install / new-workspace state. Users who have already interacted with these views keep their persisted layout, and can manually collapse if they want the new distribution.

Test Plan

• Regression test added to packages/vscode/src/__tests__/contributes-view-gating.test.ts (the existing vscode: IDE-mode foundation: dual-mode activation, workspace/IDE context keys, empty-window surfaces #1144 manifest-invariant suite): asserts the four lower-priority views contribute "visibility": "collapsed" and the three primary views keep no override. Fails without the fix, passes with it. pnpm vitest run → 21 passed.
• npm run build — passes (porch checks: build ✓, tests ✓)
• JSON validity of package.json confirmed
• Manual: VS Code Extension Development Host smoke on a fresh workspace shows the four views collapsed to headers, primary views expanded.

CMAP Review

• Gemini: APPROVE (HIGH)
• Claude: APPROVE (HIGH)
• Codex: REQUEST_CHANGES (HIGH) → resolved by adding the manifest-invariant regression test above.

Fixes #1169