fix(tools): reassemble fragmented tool names

[ImPedro29]

Summary

• reassemble fragmented OpenAI chat-completions and Responses API tool names before execution
• safely canonicalize terminal one-character truncations only when they resolve to one advertised non-MCP tool
• propagate the canonical tool identity through execution, permissions, hooks, transcript replay, and UI consumers
• cover every registered built-in tool plus fragmented, cumulative, parallel, late-name, and non-streaming provider shapes

Impact

• user-facing impact: calls such as Rea are recovered as Read instead of failing or rendering as an unknown tool
• developer/maintainer impact: tool-name recovery is centralized and shared by provider adapters and downstream consumers

Testing

• bun run build
• bun run smoke
• focused tests: 174 passing across tool resolution, OpenAI/Codex shims, execution pairing, and message normalization
• bun run desktop:test (17 passing)

Notes

• provider/model path tested: OpenAI-compatible chat completions and Responses API, including Codex translation
• screenshots attached (if UI changed): not applicable; UI changes only use the resolved canonical tool identity
• follow-up work or known limitations: ambiguous prefixes, short names, aliases, and MCP tool names intentionally remain unchanged