feat: all 10 production gaps implemented
Production improvements:
- B1: Binary size gate in CI (warn >50MB)
- B2: cargo-udeps recipe in justfile (unused dep detection)
- B3: Release profile optimizations (LTO=fat, codegen-units=1, strip, abort on panic)
- R1: Tauri updater plugin with GitHub Releases endpoint
- R3: get_version Tauri command embedded from Cargo.toml
- A1+A2+A3: Tauri updater plugin (GitHub Releases source, signing placeholder)
- M1: Crash log (~/.conductor/crash.log) with panic hook, local + private
- L1: Pre-commit hooks (fmt + clippy + ESLint — fixed existing Svelte lint)
- L2: Just recipes for updater-keys + cargo-udeps
All gates: fmt ✓, clippy ✓, ESLint 0 errors ✓, vitest 24/24 ✓, build ✓
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Co-Authored-By: Letta Code <noreply@letta.com>
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