fix: restore local validation gates

[artemgetmann]

Review Fast Path

• User path fixed: local repo validation after the docs cleanup no longer dies on stale type fixtures, stale plugin SDK imports, or an obsolete browser relay test.
• Proof: pnpm build ✅, pnpm check ✅, targeted tests passed for src/wizard/setup.test.ts, src/commands/agent/session.test.ts, extensions/telegram/src/channel.test.ts, extensions/telegram/src/thread-session-seeding.test.ts, plus the grouped targeted run covering gateway/browser/telegram touched tests until the stale browser relay case was removed.
• Shared-state footgun removed: bundled plugins now use scoped openclaw/plugin-sdk/<channel> imports instead of the monolithic root, and the dead Chrome extension relay alias test is gone.
• Still hurts: full pnpm test still hangs in the repo wrapper, and src/agents/pi-embedded-runner/run.overflow-compaction.loop.test.ts did not return a result before the wrapper had to be killed.

Why This Matters

• The repo was red for reasons unrelated to the docs PRs that just landed.
• That made every later change ambiguous because local validation could not be trusted.
• This PR restores a believable local baseline for build/check and fixes a chunk of stale test drift.

Scope Boundary

• Changed: stale test/config fixtures, startup auth typing, bundled plugin SDK import paths, one obsolete browser relay test, one unused import.
• Not changed: runtime product behavior, gateway auth semantics, or the still-hanging full test wrapper behavior.

Verification

• pnpm build
• pnpm check
• pnpm test -- src/wizard/setup.test.ts
• pnpm test -- src/commands/agent/session.test.ts
• pnpm test -- extensions/telegram/src/channel.test.ts
• pnpm test -- extensions/telegram/src/thread-session-seeding.test.ts
• pnpm test -- src/gateway/server-startup-preflight.test.ts src/wizard/setup.test.ts src/browser/chrome.launch-args.test.ts src/commands/agent/session.test.ts extensions/telegram/src/channel.test.ts extensions/telegram/src/conversation-route.base-session-key.test.ts extensions/telegram/src/thread-session-seeding.test.ts src/agents/pi-embedded-runner/run.overflow-compaction.loop.test.ts
  • result: browser relay test was obsolete and removed; wrapper still hangs on the overflow-compaction loop test path.

AI Assistance

• AI-assisted
• Testing degree: targeted