[Feature]: Render Devin sessions in native chat #30791

Problem or use case

Devin is already a first-class Orca agent almost everywhere — AI Vault scans its transcripts, Agent Session History lists it, resume works via devin --resume <id>, hooks report status, usage/quota tracking exists, and orchestration can dispatch devin workers. The one surface missing is native chat: NATIVE_CHAT_SUPPORTED_AGENT_LIST in src/shared/native-chat-agent-support.ts covers claude, openclaude, codex, grok, omp, opencode, opencode2, and zcode, but not devin. So a Devin session can only be viewed inside the terminal TUI — it cannot open in the native chat view, unlike every agent Orca considers chat-capable.

Proposed solution

Add devin to NATIVE_CHAT_SUPPORTED_AGENT_LIST and map it through resolveNativeChatTranscriptAgent to a new devin transcript agent.

Most of the substrate already exists:

• Transcript parsing: AI Vault already parses Devin's ATIF .json transcripts (session-scanner-devin-parser.ts), discovered under <DEVIN_HOME>/transcripts and (since Devin 3000.10.31) <DEVIN_HOME>/agent_logs, where DEVIN_HOME is %APPDATA%\devin\cli on Windows and $XDG_DATA_HOME/devin/cli elsewhere. A sibling sessions.db supplies working_directory, title, model, timestamps, and a hidden flag the listing should honor.
• ACP alternative/complement: devin acp runs the CLI as an ACP (Agent Client Protocol) server over stdio, and Orca already has a structured ACP launch/dialect layer (src/main/acp/*) that native chat uses for OMP/OpenCode/Grok. If the Devin ACP dialect maps cleanly onto that path, it could provide structured turns, permission prompts, and streaming rather than transcript tailing — worth evaluating either as the implementation or as a follow-up.

Alternatives or additional context

• Status quo: keep Devin terminal-only in native chat (it still appears in session history and AI Vault).
• Related: [Feature]: Optimize Devin support for Orca dispatch and agent lifecycle (orchestration, accounts, and session telemetry) #20573 (Devin lifecycle/dispatch epic), orchestration worker-start: accept --model (and --effort) for the pi and devin agents #26971 / feat(orchestration): support pi and devin worker launch models #27012 (devin worker launch models, including structured workers), Devin sessions missing from AI Vault on Windows (and parsed nearly empty elsewhere) #21330 / [Bug]: Devin session history never appears on Windows — scanner uses Linux-only transcript path with no platform fallback #15768 / fix(ai-vault): discover and parse Devin sessions on Windows #21337 (Devin transcript scanning fixes — the parsing side is already actively maintained), [Bug]: Pi + devin-acp inner Devin PermissionRequest pins pane to Needs input after ACP approval #22011 / fix(agent-status): keep a Devin run under Pi from pinning the pane on Needs input #22800 (Devin-under-Pi devin-acp pane status).