[codex] simplify Blade codebase by 30%

[echoVic]

Summary

• reduce tracked TypeScript/TSX/JavaScript from 593,930 to 413,082 lines
• remove unused subsystems, compatibility layers, forwarding APIs, and dead test infrastructure
• consolidate repeated Provider, ACP, PTY, Web, Session, and Agent-loop harnesses
• replace the broad paid qualification grid with nine high-value production trajectories
• split Session run state and Agent execution out of the Hono route controller
• document the resulting architecture and test strategy

Impact

The branch removes 180,848 net lines, a 30.45% reduction from baseline. The default suite now emphasizes deterministic state-machine and protocol tests, while paid real-API qualification covers the production paths that cannot be established locally.

session.ts no longer owns active/recent run storage or the Agent execution loop. Those responsibilities now live in sessionRunState.ts and sessionRunExecutor.ts.

Validation

• bun run build
• bun run lint
• bun run test:all
  • main stage: 464 files passed, 4,626 tests passed
  • performance: 4 files passed, 9 tests passed
• bun run --filter blade-code test:coverage
  • statements: 66.44%
  • branches: 57.96%
  • functions: 71.01%
  • lines: 67.60%
• focused Session route/SSE integration tests
• focused qualification configuration tests

Paid real-API calls were not executed. The release-blocking file selection and credential isolation contract were verified deterministically.

Notes

The working tree contains unrelated local changes that are intentionally not part of this PR.

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