feat(source): bounded C++ function analysis

[zackees]

Refs #209. Coordinated with FastLED/cli#242. Stacked on #208; upstream must land before published-release adoption.

Adds optional source-cpp with private exact tree-sitter0.26.11/cpp0.23.4. Owned records expose definition headers, byte ranges, and syntax-context flags; no backend nodes/types/traits. Arduino filtering, tab order, deduplication, generated includes, source maps and snapshot publication remain consumer policy. Preserves fbuild provenance.

Bounds: source8MiB before parsing; two-second cooperative parser deadline (not a hard CPU deadline); iterative traversal131072visits/depth256 and output16384records afterward. Not a compiler or independent parser-memory quota. AST-based parameter-default removal copies retained spans linearly and preserves line-comment terminators.

Validation: missing API RED→GREEN; additional line-comment regression RED→GREEN. Eight focused tests cover default expressions, scope/linkage, templates, attributes, function pointers, ranges, incomplete syntax, source/depth rejection, and comments. Full source-cpp feature suite, strict all-target Clippy, formatting, Ruff, dependency-isolation RED→GREEN, WindowsMSVC/macOSARM cross-checks, and read-only review passed locally. An overlapping no-cache crosscheck was refused by Soldr; serialized checks subsequently passed.

FastLED adoption and its real WASM compile remain pending. No performance or browser/Safari acceptance claim. CI is required before merge.

[zackees]

FastLED adoption is pushed in FastLED/cli#242 at73c2a33. Removed both direct parser dependencies/imports and local generic traversal/default-removal implementation. App retains Arduino filtering/deduplication/tab/editor policy. Dependency ban and line-comment regression observed RED→GREEN; all270Rust tests,32Python1skip,Ruff,strictalltargetClippy,fmt,CLIbuild and review passed. Fresh real WASM compile with forward helper call, default argument and line comments passed; inspected generated wrapper preserves newline before semicolon and removes default correctly. UnchangedEmscripten4.0.21; noJSPIentrypoints in output. Browser/Safari and exactpublishedrelease acceptance remain pending.

[zackees]

Closing as superseded: #220 replayed this stacked FastLED foundation onto current main after the #216 merge diverged, and it has landed.

Verified against origin/main (e0666e0): every file this PR's own commits add exists on main, and every distinctive added source/test line is present on main (one JSON doc-comment line was reworded). Merging this branch now would only reintroduce pre-refactor code that main has since replaced.

Reopen if something here is still missing from main.