feat: defer mobile (isDesktopOnly: true) + honest docs; release 0.1.6

[vreshch]

Makes the plugin honestly desktop-only instead of claiming mobile support that doesn't complete.

Why: mobile sign-in doesn't round-trip inside Obsidian's Capacitor WebView — window.open(_blank) opens an in-app browser (no shared auth session) and the obsidian:// deep-link callback doesn't reliably return, so users get stuck signed-out and every action is gated off. The git/VaultFs layer itself is mobile-safe; sign-in + first-sync .git detection are the unverified parts.

Change

• manifest.json: isDesktopOnly: false → true — Obsidian now hides/disables it on phones (no broken install), instead of offering a plugin that can't sign in.
• README: status banner + Features + Getting started reworded to desktop-only; "Mobile support (experimental)" → "Mobile (planned)" (groundwork in place, pending device-verified sign-in + sync).
• CLAUDE.md + a main.ts comment: corrected the stale "VaultFs built, not yet wired / desktop uses node fs" claims (VaultFs is the git fs on every platform; node fs is only the desktop ~/.agentage mirror).
• Mobile code (VaultFs, ribbon/modal, deep-link handler) stays in the repo for re-enablement.

Release: bumps 0.1.5 → 0.1.6. npm run verify green (66 tests, build, host/docs/bundle checks).

Re-enablement playbook (sign-in fix + mobile smoke) tracked in the submission/feature doc.

[github-actions]

🎉 PR Validation ✅ PASSED

Commit: 3b0c8589bf1ddfdf928171cde01b39807bf2c9f3
Branch: feature/desktop-only

Checks:

• ✅ Dependencies installed
• ✅ Type check passed
• ✅ Linting passed
• ✅ Format check passed
• ✅ Tests + coverage passed
• ✅ Build successful
• ✅ Store-compliance checks passed
• ✅ Bundle is mobile-safe

Ready to merge! ✨

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