Build retailer-neutral QueueScope v0.1.0 alpha

[RedLynx101]

Outcome

Turns the private showcase repository into a functional, public-ready Manifest V3 alpha while keeping the implementation retailer-neutral.

Included

• local-first schedule, rule, state, storage, alarm, tab-preservation, notification, and generated-audio core
• command center, side panel, watch builder, recurring/passive watches, copy/delete/auto-start controls, Queue Lab, settings, and activity ledger
• monotonic queue/challenge navigation lock, prior-queue admission guard, durable absolute ETA, position extraction, and non-discardable locked tabs
• optional per-origin access with no cookies, history, analytics, backend, or remote code
• MIT license, CI, release packaging, security/privacy/architecture docs, and browser-generated screenshots

Validation

• npm run check: pass
• unit tests: 26/26
• production MV3 artifact verifier: pass (20 files)
• unpacked-extension Chromium E2E: pass
• browser assertions: queue lock, position 428, durable ETA, admitted-after-queue, non-discardable tab, collapsed cards, pinned side-panel footer, side-panel watch copy/delete/auto-start
• npm audit --omit=dev and npm audit: 0 vulnerabilities
• current-source and full-history neutrality/secret scans: pass
• packaged ZIP smoke test: pass

The repository remains private. Visibility is intentionally left for the owner to change manually after reviewing this PR.