fix(opencode): honor MCP enabled false in opencode.json

[Buyan Khurelbaatar (buyan-kh)]

enabled: false in apm.yml was stripped as a passthrough alias and the OpenCode adapter always wrote true. Model the flag and write it through.

Description

Brief description of changes and motivation.

Issue and approved scope

Issue: # (required; use the canonical issue or a bounded child issue)

Human scope-approval comment: (link, state the trivial-documentation
standing-preapproval case, or indicate private security coordination without
disclosing report details)

Does this PR complete the issue, or what remains?

Type of change

• Bug fix
• New feature
• Documentation
• Maintenance / refactor

Testing

• Tested locally
• All existing tests pass
• Added tests for new functionality (if applicable)

Spec conformance (OpenAPM v0.1)

If this PR changes behaviour that an OpenAPM v0.1 req-XXX covers,
confirm the three-step ritual in the
development guide:

• Spec edit: docs/src/content/docs/specs/openapm-v0.1.md updated
  (new/changed <a id="req-XXX"></a> anchor + prose + Appendix C
  row).
• Manifest edit: docs/src/content/docs/specs/manifests/openapm-v0.1.requirements.yml
  updated.
• Test edit: a @pytest.mark.req("req-XXX") test under
  tests/spec_conformance/ added or extended.
• CONFORMANCE.{md,json} regenerated via
  uv run --extra dev python -m tests.spec_conformance.gen_statement
  and committed.
• N/A -- this PR does not change OpenAPM-observable behaviour.

[Copilot]

Copilot review overview

🟡 Changes recommended

There are a couple of small but concrete maintainability/convention issues in the newly added code that should be cleaned up before approval.

Get a fresh assessment by requesting another Copilot review.

Review effort: Lite
Findings: 2

Open (2)

• Add type hint for _coerce_enabled value · New
• Remove redundant enabled entry from harness extra aliases · New

What changed in this PR

This PR fixes OpenCode MCP config generation so an explicit enabled: false in apm.yml is preserved and written through to opencode.json (instead of being dropped/forced to true). It does so by modeling enabled on MCPDependency, carrying it through the MCP overlay/cache layer, and teaching the OpenCode adapter to apply it.

Changes:

• Model enabled: bool | None on MCPDependency and validate/round-trip it via from_dict()/to_dict().
• Propagate per-dependency enabled state into the MCP server info cache (_apm_enabled) and have the OpenCode adapter honor it when writing opencode.json.
• Add unit + integration tests, plus manifest-schema docs and a changelog entry for the behavior change.

File	Description
src/​apm_cli/​models/​dependency/​mcp.py	Adds modeled enabled field, parsing/validation, and serialization.
src/​apm_cli/​integration/​mcp_integrator.py	Persists per-dependency enabled into server info cache as _apm_enabled.
src/​apm_cli/​adapters/​client/​opencode.py	Applies _apm_enabled when rendering OpenCode config and adds _coerce_enabled helper.
tests/​unit/​test_mcp_from_dict_unknown_keys.py	Verifies enabled is modeled (not treated as passthrough extra) and rejects non-bools.
tests/​unit/​test_mcp_overlays.py	Ensures overlays embed/omit _apm_enabled correctly.
tests/​unit/​test_opencode_mcp.py	Adds coverage for per-entry enabled precedence and update_config behavior.
tests/​integration/​test_mcp_install_flow.py	End-to-end install test ensuring enabled is written correctly to opencode.json.
docs/​src/​content/​docs/​reference/​manifest-schema.md	Documents dependencies.mcp[].enabled semantics and passthrough-reserved behavior.
CHANGELOG.md	Adds a Fixed entry describing the OpenCode enabled behavior correction.

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