feat(tui): ship production Braid workspace

[drewstone]

Braid is the terminal product over agent-runtime: AgentProfile chooses the agent, connection and runner choose execution, and Braid renders normalized activity while owning durable conversations, branches, approvals, analysis, comparison, and automation.

What ships:

• first-run profile and connection setup for CLI Bridge and Tangle-backed execution
• complete streaming terminal sessions with cancellation, continuation, and recovery
• durable conversation graph, drafts, fork previews, import/export, and search
• ask, analyze, compare, approvals, and headless JSONL control
• encrypted SQLite state, OS/headless credential storage, snapshots, redaction, and crash recovery
• responsive 40x12 through 200x60 terminal layouts and accessible no-color/reduced-motion modes
• packed install, live Pi/Codex, performance, security, and visual proof scripts

Measured before opening:

• unit: 132/132 passed
• security: 97/97 passed
• performance smoke: 10/10 rows passed
• repeat first useful frame: 228.8 ms, target 250 ms
• uncached first useful frame: 271.9 ms, target 1,000 ms

Final full checks and refreshed visual artifacts are running on this branch.