fix(hygiene): drop machine-path literals from the srcRelStem doc comment

ROOT-HYGIENE flagged the doc comment added in e58689b: it illustrated the
checkout-location bug with a literal CI runner path, and the gate rejects an
absolute machine path anywhere in a tracked file.

    [machine-path] scripts/enumerate-signatures.ts: absolute machine path at line 868

Rewrites the two worked examples as `<workspace>/…` and `<home>/src/…`
placeholders. The contrast the comment is making — a parent directory named `src`
capturing before the repo's own `src/` — is exactly as clear without naming a real
machine, and ROOT-HYGIENE is clean rather than allowlisted.

Comment-only: the enumerator's output is byte-identical (sha256 e28eadf6…), so
port_signatures.json is untouched and SIGNATURES-FRESH stays green.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01TSHZoWoxoPVK6FuNaNKWFh

Author: mjerris

scripts/enumerate-signatures.ts

@@ -865,13 +865,17 @@ function camelToSnake(name: string): string {
  * ``class:signalwire.<modPath>.<Name>`` leaf built from it) then depended on
  * WHERE THE REPO HAPPENS TO BE CHECKED OUT:
  *
- *   /home/runner/work/…/signalwire-typescript/src/rest/namespaces/x.types.generated.ts
- *       → 'rest.namespaces.x.types.generated'                       (correct)
- *   /Users/<dev>/src/signalwire-typescript/src/rest/namespaces/x.types.generated.ts
- *       → 'signalwire-typescript.src.rest.namespaces.x.types.generated'  (WRONG)
+ * Checked out under a parent with NO ``src`` segment, the capture is the intended
+ * repo-relative one:
+ *     <workspace>/signalwire-typescript/src/rest/namespaces/x.types.generated.ts
+ *         → 'rest.namespaces.x.types.generated'                          (correct)
+ * Checked out under a parent directory that IS named ``src``, the earlier segment
+ * wins and the repo directory leaks into the module path:
+ *     <home>/src/signalwire-typescript/src/rest/namespaces/x.types.generated.ts
+ *         → 'signalwire-typescript.src.rest.namespaces.x.types.generated'  (WRONG)
  *
  * A developer whose workspace dir is literally named ``src`` (the documented
- * adjacency layout in porting-sdk/CLAUDE.md §7 is exactly ``~/src/``) produced a
+ * adjacency layout in porting-sdk/CLAUDE.md §7 is exactly that) produced a
  * DIFFERENT port_signatures.json from CI on the very same commit — 602 differing
  * leaves, all of them this spurious ``<repo-dir>.src.`` prefix. The artifact is
  * DRIFT's input, so a location-dependent enumerator makes the whole parity claim