feat(refacto-core): binary hook w/ native cmd exec + streaming

[aeppling]

From the idea of #536

Summary

• Binary hook engine: RTK can now process Claude Code hooks directly as a binary (rtk hook claude), reading JSON from stdin and responding on stdout without shell script dependencies (no jq/bash required)
• Native command executor: rtk run executes commands natively with operator logic (&&/||/;), shell builtins (cd, export, pwd), and streaming output filters — all in a single process
• Hook check command: rtk hook check [--agent] for dry-run testing of hook routing decisions
• Streaming filter infrastructure: Line-by-line output filtering with per-binary filter modes (Streaming/Buffered/Passthrough) and RAII child process management
• Multi-remote branch support: git branch -a now correctly deduplicates branches across multiple remotes
• Documentation: Added src/cmd/README.md, updated docs/TECHNICAL.md architecture diagram, folder map, and flow sections

Test plan

• 1583 tests pass (cargo test --all)
• Hook routing retest
• 20+ Chained commands

Should fix :

ISSUE #154
ISSUE #532
ISSUE #530
ISSUE #222
ISSUE #897
ISSUE #732
ISSUE #917 (for the env var prefix part)
ISSUE #294 (cover ~40%)
ISSUE #361

[aeppling]

Removed strip_quote from last release requirements, will be added back for this

[aeppling]

not ready for review, need fix for a full standardized flow