persist terminal directories on restart

[forketyfork]

Summary

• persist running terminals' working directories under [terminals] in persistence.toml using terminal__ keys, pruning out-of-grid entries and restoring valid cells at startup
• duplicate parser-owned data to avoid UAF, seed cwd when spawning/restarting, save dirs on exit, and align with Zig 0.15 ArrayList/Writer APIs plus manual z-string handling
• document the new persistence behavior in README and add pitfall notes to CLAUDE; builds tested with "just build" and "zig build test"

[Copilot]

Pull request overview

This PR adds persistence for terminal working directories, ensuring running terminals restore to their previous directories when the application restarts.

Changes:

• Added terminal directory persistence using terminal_<row>_<col> keys in persistence.toml
• Implemented pruning logic to remove out-of-bounds terminal entries when grid dimensions change
• Added seedCwd and replaceCwdPath methods to properly track and manage terminal working directories

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
src/session/state.zig	Added cwd tracking methods and basename handling for terminal directories
src/main.zig	Integrated terminal restoration from persistence at startup and saving on exit
src/config.zig	Implemented Persistence terminal storage with pruning, collection, and serialization logic
README.md	Documented the new terminal state persistence feature with example
CLAUDE.md	Added implementation notes about Zig 0.15 API changes and TOML parser pitfalls

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[forketyfork]

• Switched temporary lists to ArrayList.empty with allocator-aware append/deinit (Zig 0.15 has no init()).\n- [x] Same change for collected terminal entries and fallback list.\n- [ ] Keeping two-phase removal: removing while iterating StringHashMap invalidates the iterator; grid is tiny so extra allocation is negligible.\n- [x] Added allocZ helper and reuse for restored dirs.\n- [x] Cwd persistence now macOS-only; other platforms skip saving/restoring terminals to avoid stale paths until cross-platform tracking exists. README/CLAUDE note added.