Expand terminal agent support and harden status detection

[DanielOu1208]

Summary

• add terminal-derived launcher, process identity, status detection, and icons for OpenCode, Cursor CLI, OMP, Pi, and Droid alongside Codex and Claude
• keep the collapsed notch agent icon/status presentation working for manually typed agents as well as hover-launched agents
• harden status freshness so old terminal text and old PTY output cannot override a new ready prompt or leak across a session restart
• document all seven agents, the three-visible-launcher limit, embedded-terminal boundary, and third-party mark ownership

Root causes fixed

• The five new status rules checked historical bottom-buffer activity before the current composer or authoritative OMP title.
• Pi's current trust selector uses Project trust, Trust, and Do not trust, while the detector only recognized older wording.
• Swift parsed OSC title events separately from libghostty, so title freshness could diverge from the terminal's accepted state and title copying was not byte-bounded.
• PTY output queued for the main actor and coordinator output already buffered before a restart were not scoped to the current session generation.

The fix uses libghostty's native title-change callback, bounds title decoding to 1,024 bytes and 256 sanitized characters, rechecks PTY generation at delivery, and invalidates coordinator buffers by epoch on restart.

Validation

• xcodebuild test -project GhostNotch.xcodeproj -scheme GhostNotch -destination 'platform=macOS'
• xcodebuild analyze -project GhostNotch.xcodeproj -scheme GhostNotch -destination 'platform=macOS' CODE_SIGNING_ALLOWED=NO
• unsigned Release build
• python3 scripts/remove-agent-hooks.py --self-test
• asset-catalog JSON parsing and SVG XML validation
• git diff --check

ShellCheck reports the pre-existing SC2115 warning in the untouched scripts/build-ghostty-vt.sh; this PR does not alter that script.

Manual acceptance still pending

• Codex and Claude live sessions
• OpenCode permissions, interruption, relaunch, and exit
• Cursor CLI command approval, interruption, relaunch, and exit
• OMP title-state transitions, interruption, relaunch, and exit
• Pi project trust, interruption, relaunch, and exit
• Droid permissions, interruption, relaunch, and exit
• collapsed and hover visuals for all seven icons on a notched Mac

Agent marks remain third-party property and are included only for product identification; their inclusion does not imply affiliation, sponsorship, or endorsement.