feat: add edit_asset MCP tool

[bobby-smedley]

🎯 What does this PR do?

Adds the edit_asset MCP tool — a single entry point for updating any Collibra asset via a typed operations array.

Eight operation types

• update_attribute, add_attribute, remove_attribute
• update_property (whitelisted: name, displayName, statusId)
• add_relation, remove_relation
• add_tag
• set_responsibility

Server-side niceties (no agent plumbing required)

• Name → ID resolution: attribute names, relation roles, resource roles, status names, and user identifiers (username or email) all resolve server-side via Collibra's REST API. The agent never has to pass a raw UUID for a human-known name.
• Case-insensitive + whitespace-tolerant matching on every name lookup so "candidate", " Candidate ", and "CANDIDATE" all hit.
• Errors suggest valid options — e.g. attribute "Bogus" is not valid for asset type "Business Term" in this domain. Attributes available: Acronym, Definition, Note (and 4 more). so the model can self-correct in one step.
• Two-phase execution / partial success: every op is validated against the asset's scoped assignment before any writes; invalid ops surface as per-op errors while valid siblings still apply (status: partial_success).
• Bulk batching: 2+ same-type ops (add_attribute, update_attribute, add_relation) are coalesced into Collibra's /bulk endpoints; single ops use the cheaper individual endpoints.
• Lazy resource fetches: /roles and /statuses are only fetched when the request actually contains an op that needs them.

Design decisions worth flagging

• set_responsibility uses POST /rest/2.0/responsibilities (incremental, per-row) instead of the ticket-referenced PUT /rest/2.0/assets/{id}/responsibilities (destructive replace-all). Avoids an upsert-merge step.
• add_relation assumes the edited asset is the relation's source (head). Reversed directions surface as a Collibra 4xx per-op error, which the agent can read and retry.
• Ambiguous attributeName (multiple instances of the same attribute type) returns a disambiguation error rather than performing a silent multi-write.

Files

• pkg/tools/edit_asset/{tool.go,operations.go,bulk.go,tool_test.go} — new package
• pkg/clients/edit_asset_client.go — REST helpers + DTOs
• pkg/tools/register.go — register the tool

Tests

40+ unit tests covering happy paths per op type, validation paths, partial success, bulk batching, name resolution (status/role/user), case-insensitive matching, suggestion-in-errors, and lazy-load checks. Test stub now strictly enforces real
Collibra wire formats so future field-name regressions fail loudly in CI.

✅ Checklist

• My code follows the style guidelines of this project.
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• I have made corresponding changes to the documentation (if needed).
• My commit messages follow the Conventional Commits standard.