fix: replace panics with proper error handling

[jdx]

Summary

• Replace unwrap(), panic!(), and unreachable!() calls with proper error handling to prevent crashes in production
• Add graceful recovery from mutex poisoning
• Add fallbacks for environment initialization failures

Changes by File

File	Changes
src/ipc/client.rs	Replace panic! and 9 unreachable! macros with bail!
src/ipc/server.rs	Replace panic! with bail!
src/main.rs	Signal handler uses match instead of unwrap
src/supervisor.rs	Fix signal setup, child.id(), stdout/stderr capture, file opens, async writes, upsert_daemon calls, PID parsing
src/env.rs	Add fallbacks for current_exe, current_dir, and home_dir
src/state_file.rs	State file init recovers gracefully from errors
src/procs.rs	Add mutex recovery helper, fix process parent lookup
src/logger.rs	Mutex lock recovers from poisoning
src/cli/logs.rs	Fix regex capture handling, HashMap lookups
src/cli/config/add.rs	Fix path Option handling

Test plan

• cargo build passes
• cargo clippy -- -D warnings passes
• cargo test - all 34 tests pass

🤖 Generated with Claude Code

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Note

Strengthens reliability by eliminating panics and adding graceful recovery paths across core subsystems.

• IPC: replace panic!/unreachable! with bail!; validate null-bytes; improve connect retry/reporting (src/ipc/{client,server}.rs)
• Supervisor: safer process spawn/IO handling, guarded stdout/stderr capture, resilient log writes, non-fatal upsert_daemon updates, robust signal setup (Unix/Windows), cron/retry flow preserved (src/supervisor.rs)
• Logging/Procs/State: recover from mutex poisoning, add safe System lock helper, tolerate state file read/parse errors (src/{logger.rs,procs.rs,state_file.rs})
• Env/CLI: fallbacks for current_exe, current_dir, home_dir; safer path display and log file/tail handling; resilient log line parsing and time truncation (src/{env.rs,cli/{config/add.rs,logs.rs}})

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