v0.1.0

Added

• Capability broker mediating all command execution through safety tiers (read, build, write, dangerous)
• 19 built-in capabilities: cat, chmod, cp, find, git, go, grep, head, ls, make, mkdir, mv, rm, sort, tail, tee, tr, uniq, wc
• Pipeline syntax with Unicode operators (¦, ›, ‹) that survive unquoted in all shells
• Compound command operators (＆＆, ‖, ；) for conditional chaining
• Per-subcommand tier mapping for git and go
• Argument-level safety rules (hardcoded and configurable) with --retry bypass
• SHA-256 hash-chained audit log with integrity verification
• YAML configuration for tiers, audit path, and custom rules
• Agent integration guide (doit --help-agent)