Fix Antigravity IDE sync

[SaulMoreno3]

Summary

Fixes Antigravity IDE sync after the Google Antigravity rename/migration.

The new Antigravity IDE language server exposes its local RPC endpoint over HTTPS with a self-signed local certificate. The existing sync path only spoke plain HTTP, so tokscale antigravity sync could see filesystem candidates but detected zero usable connections and cached zero sessions.

This PR:

• keeps the existing plain HTTP RPC path for older Antigravity installs
• adds HTTPS RPC fallback with invalid local certs accepted for 127.0.0.1
• accepts a successful HTTPS Heartbeat response as a valid local Antigravity endpoint after process filtering
• scans migrated local data roots:
  • ~/.gemini/antigravity-ide
  • ~/.gemini/antigravity
  • ~/.gemini/antigravity-backup
• adds tests for Antigravity IDE process detection and migrated filesystem roots

Fixes #641.

Local verification

Before this change, with Antigravity IDE open:

detected connections: 0
filesystem candidates: 103
export candidates: 103
cached sessions after sync: 0

After this change, with the same Antigravity IDE instance:

detected connections: 2
detected sessions: 0
filesystem candidates: 103
export candidates: 103
cached sessions after sync: 100

Reports then recovered historical Antigravity usage across February-May 2026.

Tested with:

cargo fmt --check
cargo test -p tokscale-cli antigravity -- --nocapture

---

Summary by cubic

Restores Antigravity IDE sync by adding HTTPS RPC support for the renamed language server, bypassing proxies, and scanning new data roots while keeping the legacy HTTP path. Sync now detects the local endpoint and caches sessions again. Fixes #641.

• Bug Fixes
  • Added HTTPS RPC fallback (accepts self‑signed certs on 127.0.0.1 and bypasses proxies) and treats a well‑formed Heartbeat as a valid endpoint.
  • Kept plain HTTP for older installs; probes heartbeat and identity over HTTP, then HTTPS.
  • Scans migrated data roots: ~/.gemini/antigravity-ide, ~/.gemini/antigravity, ~/.gemini/antigravity-backup.
  • Updated process detection to include the IDE language server; added tests for process detection and multi-root scanning.

^{Written for commit e3e70eb. Summary will update on new commits.}

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1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
tokscale	Ignored	Preview	May 31, 2026 7:46pm

[cubic-dev-ai]

1 issue found across 1 file

<sub>Reply with feedback, questions, or to request a fix.

Re-trigger cubic</sub>

[SaulMoreno3]

Addressed the performance concern in the latest push. The HTTPS fallback now reuses a process-wide current-thread Tokio runtime and a cached reqwest::Client via OnceLock, so HTTPS-only Antigravity IDE installs no longer pay runtime/client construction cost per RPC.\n\nRe-verified locally with:\n- cargo fmt --check\n- cargo test -p tokscale-cli antigravity -- --nocapture\n- ./target/debug/tokscale antigravity sync\n\nThe real sync still detects 2 connections and keeps 100 cached sessions.