test(editor): implement VS Code interface and source-edit matrices

[Lojhan]

Status: draft, do not merge

The complete interface/edit matrix is implemented. Latest full local run on VS Code 1.134.0: 80/84 VS Code interface cells passed, 4 failed; all 20 edit cases passed; four trust/lifecycle hosts passed. Zed: 84 not-run. Evidence: artifacts/editor-host/results/v-ZnJzo6. Linux CI run 34041160111 reproduces exactly the four coexistence failures (v-L06lg6).

All four failures are builtin-coexistence: with the built-in TypeScript extension enabled, VS Code combines an any hover with the correctly inferred typed-sql row type. Tracked in #196. No failed assertions were removed or downgraded. Provider ownership needs a supported product design, not silently disabling user extensions.

Implementation

21 named interfaces across PostgreSQL, MySQL, SQLite and synthetic. Five edit cases per grammar: local/cross-file rename, document/range formatting and structural quick fixes. Fresh tarball installation, real-server configuration restart with unsaved replay, mixed-grammar multi-root, TSX, ordered parameter tuples, SQL providers and semantic tokens. Exact buffer ownership, SQL preservation and idempotence assertions. Disjoint evidence aggregation rejects mixed versions and duplicate checks.

Merged fixes

PR #197 merged after every applicable required check passed, closing #192, #194 and #195. It fixes folder configuration, isolated host updates/version drift, SQL-hover routing and rapid-open cancellation/immutable snapshots. This draft now includes main. The post-merge runner retains main folder-workspace coverage; focused editor contracts pass. Full matrix evidence above predates this synchronization; new CI is separate.

Closes #191
Related #155, #169 and #196.

Limits

Named interface inventory is not exhaustive SQL syntax or upstream refactor coverage. Actual Zed execution, abrupt real-server crash inference, remote hosts and editor-side stale-edit rejection remain outstanding. The initial single-pass milestone and its failures remain in prior PR history; subsequent fixes and verification were authorized by the merge-and-continue request.

[Lojhan]

Single local pass completed; no retry. Build/typecheck, quality, packaging and all 15 focused test files passed. Existing 32 grammar cells and four trust/lifecycle hosts passed on VS Code 1.134.0. PostgreSQL extended completed with 12 failed interface checks / 5 failed edit cases due the folder configuration scope blocker (#192). MySQL extended also failed startup, but reported host 1.135.0; its baseline used 1.134.0. The version guard rejected aggregation and stopped the command. The isolated application updater was active. Remaining extended/coexistence hosts were not run.

Final compatible matrix artifact: VS Code 32 passed, 12 failed, 40 not-run; Zed 84 not-run. Edit matrix: 5 failed, 15 not-run. MySQL raw 1.135.0 results remain retained separately, not counted as compatible evidence. No production fixes or post-test code edits were made. Draft PR remains unmerged; the implementation is present but complete host validation is blocked.