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rcourtman
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Stacked on #2715 (its commit is this branch's parent; whichever lands first, the other still merges). ## Problem A manual link merges two resources for display, but `PersistIdentityPins` pinned the merged identity. A link primary was pinned with the folded resource's machine key, and the store's one-owner-per-key rule deleted the folded resource's own pin. For a Proxmox node with a qualified endpoint (`https://pve1.example.test:8006`) linked to a host agent, the node's pin records the endpoint, so the next rebuild completed the agent's machine key from it, minted the agent's machine-derived ID and merged the two by ID before the link applied. With the node as primary, succession then rewrote the link into a self-link on the agent's ID; in either direction, removing the link left the pair merged. Reproduced through `MonitorAdapter.PopulateSnapshotAndSupplemental` with a `MemoryStore` on #2715's head. ## Change - `applyManualLinks` captures each side's own pin before the merge (`recordLinkOwnPin`, first capture per rebuild wins), and `PersistIdentityPins` writes those instead of the merged projection, keeping a pinnable folded side pinned under its own canonical ID. - Link sides write through a new `ResourceStore.ReplaceResourceIdentityPins` (both stores). Like an upsert the row keeps fields the side's own pin leaves empty, but it drops a strong key another resource holds this rebuild, which is how a key an earlier release borrowed from the merged identity leaves the row. - A folded side drops a key a live resource or an earlier folded side already holds instead of trading it every rebuild, and writes no pin when that would cost it its machine evidence (a cluster-only row would be open to cluster-slot succession). - Proxmox auto-links (LinkedAgentID / identity matcher) merge before any manual link applies, so their boot-window pins are unchanged (`TestIssue1753*`, `TestMonitorAdapterRebuildPersistsIdentityPins` pass). Known limits, written into the contract: a node row an earlier release already filled with the agent's key still merges the pair by ID while the node can complete from it; two live resources sharing a strong key still alternate, as on main; evidence a later record pass of the same rebuild merges into an already-joined row reaches neither side's pin. ## Verification - New tests in `registry_merge_policy_test.go` (standalone and clustered node, both link directions, three rebuilds with no steady-state pin writes, then unlink separates the pair; shared-key, kept-field, hostname-guard, machine-loss and borrowed-key cases) and `store_test.go` (replace vs upsert on memory and SQLite). - Each new test fails against #2715's runtime files via `go test -overlay`; each guard rule fails its own test when removed. - `internal/unifiedresources` full package, `internal/monitoring` link/identity tests, `internal/api/resourceapi`, `go build ./...` and `go vet` pass. - Contract: `unified-resources.md` clause 25 and "Operator links reach record-ingested resources".