chore: remove dead code in crawler.py — CONFIG_PREFIXES_OF_INTEREST and unused top variable

[bipinhcs11]

What

Two-line dead-code removal in tools/skill_generator/crawler.py.

Why

These are orphaned remnants from an incomplete filtering design that was noted as a follow-up in the review comments of PRs #15 and #16 but never acted on:

1. CONFIG_PREFIXES_OF_INTEREST (lines 58–62 before this PR)

CONFIG_PREFIXES_OF_INTEREST = (
    "datasource", "spring.datasource", "mail", "spring.mail",
    "file", "batch", "spring.batch", "queue", "scheduler",
    "quartz", "kafka", "redis", "app", "logging",
)

Defined at module level, never referenced in any code. The docstring of _extract_properties_prefixes claimed the function filtered against it — it never did. Confirmed with a full-repo grep: only appears in its own definition and the stale docstring.

2. top = key.split(".", 1)[0] in _extract_properties_prefixes

Assigned but never read. Would have been the variable used to drive the filter that was never wired up.

Changes

File	Change
tools/skill_generator/crawler.py	Remove CONFIG_PREFIXES_OF_INTEREST constant (6 lines); remove top = … assignment (1 line); update docstring to describe what the function actually does

Behaviour impact

None. top was never read, so its removal cannot change any output. The constant was never referenced, so its removal cannot change any behaviour. This is pure dead-code cleanup.

Test impact

172 tests pass unchanged. No test referenced CONFIG_PREFIXES_OF_INTEREST (confirmed by grep).

Follow-ups in other open PRs

• PRs test: smoke tests for update.py — last uncovered module #12 / test: smoke tests for update.py (Phase 2 incremental updater) #14 / test: smoke tests for update.py (was the only uncovered module) #17 add tests/test_update.py (update.py coverage gap)
• PR fix: detect <java.version> in pom.xml — Spring Boot standard was ignored #15 fixes _detect_java_version for <java.version> in pom.xml
• PR fix: _apply_links overwrites related_skills regardless of current value #16 fixes _apply_links overwriting related_skills with stale value

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