refactor(platform-api-docs): use ts-morph globbing for file discovery

[cryptodev-2s]

Stacked on #9913, targets its branch.

Replaces hand-rolled file discovery with Project#addSourceFilesAtPaths, which takes glob patterns directly. Drops discovery.ts, the per-file add/extract loops, listTargetSubdirectories, and the glob dependency. Also merges the two Project factories (they differed by one field) and removes the redundant getSourceFile() guard, closing #9913 (comment).

Net 254 lines deleted. Generation over this monorepo: 114s to 8.6s.

Output is byte identical. diff -r on full docs trees generated before and after, for core, mobile and extension: all empty, sidebars included.

Two traps, if you touch these patterns

Both produced wrong output while the whole suite stayed green.

• Glob roots need realpath. The matcher does not follow a symlinked ancestor. Under /var/folders/... the declaration glob returned 0 where /private/var/... returned 1980, so any project under /tmp or /var would have emitted empty docs.
• Negations must be anchored. !**/*.test.ts resolves against the process cwd, not against the pattern it accompanies. Since yarn workspace sets cwd to the package dir, every exclusion silently stopped matching and test fixtures leaked in (117 namespaces instead of 112).

Related: declaration-file exclusions are deliberately narrower than the source ones. A blanket dist/** matches the segment those files live under and drops all 1980.

Behaviour change

A broken symlink used to emit a per-file parse warning. The matcher now resolves it away before ts-morph sees it, so it is skipped silently; valid files are still documented. One test rewritten to match.

Follow-up

Second step makes each strategy self contained, which is what #9913 (comment) asked for. Worth knowing before that review: extraction.ts is a scan-only front end welded onto a shared core, so the split has to cut through it too, not just generate.ts.

Checklist

• I've updated the test suite for new or updated code as appropriate
• I've updated documentation (JSDoc, Markdown, etc.) for new or updated code as appropriate
• I've communicated my changes to consumers by updating changelogs for packages I've changed
• I've introduced breaking changes in this PR and have prepared draft pull requests for clients and consumer packages to resolve them

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Note

Medium Risk
Changes how docs discover and filter thousands of source files; incorrect globs or exclusions could omit capabilities or leak test fixtures, though output is intended to stay byte-identical and tests cover key edge cases.

Overview
Replaces the glob-based discovery module and per-directory file loops with ts-morph addSourceFilesAtPaths, dropping the glob dependency and discovery.ts / its tests. Shared createProject() in new ts-project.ts replaces the duplicate extraction and root-messenger project factories (and createExtractionProject is removed from extraction.ts).

The scan path now builds anchored exclusion globs (buildTsSourceExclusions / buildDeclarationFileExclusions), resolves scan roots via realpath (toGlobPath), and sorts matched files for stable deduplication. Exclusions are anchored at each package’s src so a workspace package literally named test is no longer skipped wholesale; a regression test covers that.

Behavior: unreadable paths (e.g. broken symlinks) are filtered by the matcher without the old per-file parse warning; generation still documents valid files. Changelog credits PR #9990.

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