feat(profile): add OpenCode profile adapter

[christso]

Summary

• add OpenCode profiles through additive OPENCODE_CONFIG and OPENCODE_CONFIG_DIR overrides
• file-install profile skills and commands, serialize strict settings plus local/remote MCP into one owned config, and generate launchers
• reject native plugin mode because OpenCode lacks a complete inspect/update/remove lifecycle
• clean exact runtime-generated metadata while retaining modified or unrelated root content

Stack

• Prerequisite: feat(profile): materialize global Pi and OMP profiles #475
• Related: feat: declaratively materialize global agent profiles #460

Validation

• bun run typecheck
• bun run lint
• bun run build
• bun test — 1687 pass, 6 skip, 0 fail
• bun run test:e2e — 142 pass, 4 skip, 0 fail
• bun run docs:build
• focused final review — no P0-P2 findings

Real runtime dogfood

OpenCode 1.18.30 in an isolated HOME/XDG sandbox:

• installed a file-backed profile with launcher, strict settings, commands, skills, and a disposable stdio MCP server
• debug config proved profile settings override conflicting global values while preserving non-conflicting global values
• mcp list connected to the disposable server; generated config retained {env:DOGFOOD_TOKEN} while runtime resolution supplied the environment value
• debug skill proved profile skills stay out of default OpenCode, project A/B skills remain project-local, and named/default launchers preserve normal project discovery
• two targeted updates were idempotent and left both project trees unchanged
• one-pass removal deleted managed config, skills, commands, launcher, runtime-generated .gitignore, state, and root while preserving global and project files

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