fix(editor): scoped configuration and safe rapid-open synchronization

[Lojhan]

Scope

Extract independently verified reliability fixes from draft matrix PR #193, which remains blocked by built-in TypeScript coexistence (#196).

Closes #192
Closes #194
Closes #195

• Resource-scope all folder-owned typedSql settings. Existing four-grammar actual VSIX hosts now open a .code-workspace file to exercise folder configuration.
• Disable application updates in isolated test profiles, use a fresh pinned cache, create it recursively on clean CI and reject version drift before launch.
• Route SQL hover through grammar analysis, retaining native TypeScript hover elsewhere.
• Preserve immutable source snapshots and send didOpen when rapid changes supersede initial analysis before any upstream overlay exists.
• Add real pinned-upstream rapid-edit and SQL-hover regression tests and a patch Changeset.

Verification

Build, focused real-protocol integration and editor distribution contracts pass in this clean worktree. The same production changes also passed all 11 language-server test files plus 80/84 actual VS Code interface cells and all 20 edit cases in the expanded matrix. The four failures are built-in provider coexistence, tracked honestly in #196; no matrix assertion is weakened or skipped here. This PR retains the existing main host suite and adds folder-workspace coverage. Required CI must pass before merge.

No public API or dependency version changes. No user editor settings or extensions are changed by the tests.