fix(powershell): shield here-strings; close final 3 tri-comparison ledger shapes

[squid-protocol]

Final pass of the tri-comparison-ledger-sweep. Every reproducing discrepancy shape in
docs/self_scan/tri_comparison_ledger.json is now status: validated (was 3 unvalidated,
count 1 each). GitGalaxy ties or beats tree-sitter and Universal Ctags on function/class
detection for every language in the corpus.

Engine fix — #2450 (PowerShell here-strings)

PowerToys/generate-interface.ps1 generates a C#/IDL interface from a
Write-Output @"namespace ... enum ProviderType { ... }"@ here-string. PowerShell's
embedded_syntax lexical family strips only # / <# #> comments, and prism.py had no
here-string handling in the code_stream path, so the here-string body leaked through and
class_start matched enum ProviderType as a real class.

Fixed with _strip_powershell_herestrings in _strip_segment_comments's pre-processing step
(blanks @"..."@ / @'...'@ bodies, newline-count preserving, captures to the doc stream —
same idiom as _strip_python_docstrings / _strip_php_string_mass).

PowerShell class precision 90.0% → 100.0% (extra_classes 1 → 0).

Tooling fix — #2451 (HTML embedded-grammar injection in the gatherer)

tri_comparison_gatherer.py's tree-sitter walk now injects the css/javascript grammar for HTML
<style> / <script> elements, reusing the accuracy audit's own _html_embedded_ts_funcs
(the exact mechanism #2421 added to tree_sitter_accuracy_audit.py). layout.html:40's
@media only screen { ... } — which GitGalaxy's polyglot detector correctly reports as a
function media — was invisible to tree-sitter-html (opaque raw_text), so a correct find
looked like over-detection. media is now in GitGalaxy+tree-sitter consensus.

Ledger verdicts

• powershell class shape → GitGalaxy FP, fixed (PowerShell: class_start/func_start match declarations inside @"..."@ here-strings #2450).
• html function shape → GitGalaxy correct, now corroborated by tree-sitter (fix(powershell): shield here-strings; close final 3 tri-comparison ledger shapes #2451);
  ctags-html has no CSS parser (documented).
• haskell function shape (n=1) → reconciler rank-pairing artifact: ctags-haskell tags one
  function once per line (name line + :: signature line + equations), so
  pandoc/Shared.hs's addPandocAttributes gets 3 ctags tags vs 1 each from
  GitGalaxy/tree-sitter. Not a defect in any engine. Documented in ctags_reader.py.

No credit/debit on any shape.

Independent Gemini audit

An agy (Gemini 3.1 Pro) read-only audit of the 4 languages where GitGalaxy's raw function
count trails tree-sitter (perl −122, cpp −122, c −60, dart) confirmed all are tree-sitter
over-detection — bodyless sub NAME($$$); prototypes (perl, per #1608), OPCODE(...)
bytecode-dispatch macros and bare bool/void members (cpp), macro array-initializers and
#if 0 dead code (c) — except dart, whose real recall gap is already tracked in #2072.
Gemini's one dissent (cpp conversion operators are "real code GitGalaxy misses") did not hold
up on verification: GitGalaxy finds all 60 Variant::operator X() definitions in
godot/variant.cpp; the difference is tree-sitter's () const naming suffix, not a miss.

Differential Scan

• Both golden masters re-blessed — diff is .ps1 files reclassifying here-string mass from code
  LOC to doc LOC, plus Global Ecosystem / directory-magnitude / topological ripple. No
  function/class count changes anywhere. crucible_check.py --mode both PASS.
• tree_sitter_accuracy_audit.py --all --ci 31/31 OK. tri_comparison_chart.py --all --ci OK.
• Full tests/core_engine + tests/extraction pass. audit_check.py clean. Ledger / chart /
  points-of-interest regenerated (--all).

Closes #2450, closes #2451.

🤖 Generated with Claude Code

https://claude.ai/code/session_019Zm1uVBpVEZJ9SB7bWFR8S

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