feat(setup): validate CommandCode integration candidate for PR #1123

[dnlrsls]

Linked Issue

Closes #1119

Temporary CI-only draft. Do not merge this PR. This branch validates the integration of contributor PR #1123 with current main; it does not replace or update #1123. After CI, the maintainer will decide how to hand the verified resolution back to the contributor PR.

PR Type

• type:feature — New feature
• type:bug — Bug fix
• type:docs — Documentation only
• type:refactor — Code refactoring
• type:chore — Maintenance
• type:breaking-change — Breaking change

Summary

• Reconcile the eight conflicts between CommandCode PR feat(setup): add CommandCode CLI as supported agent #1123 (b994389) and upstream main (f2efd5f), retaining both CommandCode and Kimi setup.
• Run Linux CI against the local merge candidate d872b87 before touching the contributor's PR branch.

Changes

Files	Change
internal/setup/agents.go, internal/setup/registry.go, internal/setup/registry_test.go	Register and test the CommandCode declarative MCP and memory adapter alongside existing agents.
cmd/engram/main.go, cmd/engram/main_test.go	Include CommandCode in setup help and post-install tests.
README.md, docs/AGENT-SETUP.md, docs/INSTALLATION.md, docs/codebase/integrations.md	Document the CommandCode integration alongside current main content.

Test Plan

• Focused setup and CLI tests passed locally: go test ./internal/setup ./cmd/engram.
• Server E2E tests passed locally: go test -tags e2e ./internal/server/....
• Full go test ./... passes locally: Windows/MSYS plugin tests fail with the same named failures on a clean main baseline; this draft exists to check Linux CI on the integrated candidate.
• Reviewed merge diff against exact main parent: only the original nine CommandCode paths (77 additions, 4 deletions).

Native review of the local candidate was approved and acknowledged. Review is not merge or delivery authorization. No changes to contributor PR #1123 are authorized by this draft.

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