feat: activate local-only team memory in open build

[Flo5k5]

Summary

Enable team memory in local-only mode for all open-build users. Two lines changed.

Key insight: team memory is already local

The team memory implementation is already almost entirely local — extraction, UI, prompts, file detection, path validation, and secret scanning all operate on local files. The cloud sync (OAuth + HTTP to /api/claude_code/team_memory) is a cleanly separated overlay. The watcher does an early return at watcher.ts:256 when OAuth is unavailable, so without OAuth the feature degrades gracefully to local-only storage.

Changes

1. scripts/build.ts — TEAMMEM: false to true (includes team memory code in bundle)
2. src/memdir/teamMemPaths.ts:77 — isTeamMemoryEnabled() returns true when auto-memory is enabled (previously gated by GrowthBook tengu_herring_clock which returned false in stub)

What works locally (zero additional changes needed)

• Memory extraction with combined auto + team prompts
• Team MEMORY.md loaded into conversation context
• File selector with "Open team memory folder" option
• Collapse tracking (read/search/write counts)
• Secret scanning before persistence (blocks writes containing API keys)
• Path validation + symlink escape protection
• Team memory scoped per-project at ~/.claude/projects/<project>/memory/team/

What requires OAuth (not available in open build)

• Cloud sync between team members (push/pull via API)
• File watcher auto-push (watcher skips gracefully)

Relationship to other PRs

• feat: local feature flag overrides via ~/.claude/feature-flags.json #639 (local feature flags) — users can set {"tengu_herring_clock": false} to disable team memory if needed
• feat: open useful USER_TYPE-gated features to all users #644 (USER_TYPE cleanup) — no overlap

Test plan

• bun run build — compiles successfully
• bun run smoke — smoke tests pass
• Verify ~/.claude/projects/<project>/memory/team/ directory is created
• Verify team MEMORY.md is loaded into conversation context
• Ask Claude to save a team memory, verify it writes to the team directory
• Verify the sync watcher does not crash (graceful early return)
• Verify secret scanning blocks writes containing API keys

[Copilot]

Pull request overview

Enables team memory functionality in the open build by turning on the TEAMMEM build feature flag and removing the GrowthBook/feature-flag gate so team memory becomes active whenever auto-memory is enabled.

Changes:

• Enable TEAMMEM in the open-build bundler feature flags.
• Make isTeamMemoryEnabled() return true whenever auto-memory is enabled (removing the tengu_herring_clock flag check).

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
scripts/build.ts	Turns on the TEAMMEM build-time feature flag so team memory code is included in the open-build bundle.
src/memdir/teamMemPaths.ts	Removes the GrowthBook gate and unconditionally enables team memory when auto-memory is enabled.

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