feat(workstation): add Workstation resource kind

[vanducng]

Summary

• New Workstation resource kind: reconcile SSH workstations via WS RPC (workstations.create/update/delete, permissions.add/remove, linkAgent)
• SSH credentials (privateKey, host, user, knownHostsFingerprint) declared write-only — excluded from diff, never logged, encrypted at rest by goclaw
• Prune safety verified: workstations.list returns createdBy; prune skips any resource where createdBy != "gcplane" — imperatively-created workstations (e.g. coding-agent with created_by=vanducng) are never auto-deleted
• Agent links are add-only (no unlinks) — goclaw has no workstations.links.list RPC yet; guarded by nil current sentinel with explanatory comment

Tests

13 new tests (11 unit + 2 reconciler):

• Observe found/not-found/strips-internal-fields
• Create with allowlist + agent links
• Create without allowlist/agents
• Update with permission diff (add + remove)
• Delete idempotent / not-found
• ListAll with mixed createdBy
• BuildCreateParams: SSH metadata folding, allowlist/agents exclusion
• WriteOnlyFields registration
• TestReconcile_Prune_SkipsNonGcplaneOwned — prune never deletes createdBy=vanducng workstation
• TestReconcile_Workstation_AdoptExisting — existing non-gcplane workstation takes Update path (no duplicate Create)

All 15 packages pass (go test ./internal/... && go vet ./... && go build ./...).

Deploy note

Do NOT merge the goclaw-config feat/workstation-resource branch until this gcplane release is deployed — reconciling an unknown Workstation kind on the running gcplane would break the reconcile loop.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 5ea88040-2fa7-4fd4-a732-4a214c19a5f6

📥 Commits

Reviewing files that changed from the base of the PR and between b05821f and 647c842.

📒 Files selected for processing (9)

• internal/manifest/field_config.go
• internal/manifest/types.go
• internal/manifest/validate.go
• internal/provider/goclaw/list_all.go
• internal/provider/goclaw/provider.go
• internal/provider/goclaw/workstation_test.go
• internal/provider/goclaw/workstations.go
• internal/reconciler/engine_test.go
• internal/tui/app.go

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/workstation-resource

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