refactor(cli,ffi): relocate file_watcher to libgossamer with C-ABI exports

[hyperpolymath]

Summary

• Moves cli/src/file_watcher.zig → src/interface/ffi/src/file_watcher.zig so any libgossamer consumer (today's native Zig CLI, the planned Ephapax-wasm CLI behind a host launcher, third-party embedders) shares the same hot-reload path.
• Adds two C-ABI exports: gossamer_watcher_start(handle, config_json, frontend_dist) -> opaque* and gossamer_watcher_stop(opaque*) -> void. The start path dupes both buffers into watcher-owned memory so callers may free their inputs on return.
• Updates cli/src/main.zig to call the new exports via extern fn decls instead of importing the moved file.

Why

Phase 14a.2 of porting the gossamer CLI to typed-wasm Ephapax (umbrella issue forthcoming). The watcher is platform-coupled GTK-thread-marshalling code — it belongs in FFI/Zig per the architecture rule, not in the CLI's application code. Relocating it now means the future Ephapax port doesn't need to re-implement hot-reload from scratch.

Test plan

• zig ast-check on all three touched files — zero parse errors.
• Reviewer: confirm CI's GTK3/WebKitGTK build succeeds (local WSL env doesn't have the dev headers installed; CI does).
• Reviewer: smoke-test gossamer dev against a real project — edit a watched file, confirm reload still fires.

Notes for reviewer

• WatcherState gained two optional fields (owned_json, owned_frontend_dist) that store dupes of the caller's strings. The Zig-native start() path leaves both null for back-compat; only the new C-ABI gossamer_watcher_start populates them.
• The hand-rolled JSON path-array parser in parseWatchConfig is unchanged. A real JSON parser belongs in libgossamer (planned in a follow-up: gossamer_conf_load).

🤖 Generated with Claude Code

[github-actions]

🔍 Hypatia Security Scan

Findings: 41 issues detected

Severity	Count
🔴 Critical	21
🟠 High	4
🟡 Medium	16

⚠️ Action Required: Critical security issues found!

View findings

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