fix(ev): keep the BNetzA safety floor armed when it is set below 1

[GeiserX]

PUMPERLY_BNETZA_MIN_STATIONS=0.5 floored to 0, and refreshed < 0 is never true, so the guard on the BNetzA scraper's two destructive sweeps (stale-row prune, Open Charge Map retirement) was silently gone for anyone who set a fractional or zero floor. base.run() still blocks a truly empty fetch, so this needed a misconfigured floor plus a degraded fetch to bite, but a guard that can be turned off by a typo is not a guard.

Values that floor below 1 now fall back to the 10,000 default, the same as a non-numeric value. The regression test covers 0.5, 0 and -3 and fails against the previous line.

Also fixes the README feature bullet that still claimed Open Charge Map covers every country (Germany and Spain use their official registries).

Follow-up to #143, from CodeRabbit's post-merge finding.

Summary by CodeRabbit

• Bug Fixes

  • Improved EV charging station data cleanup safeguards when configured minimum thresholds are invalid, including fractional values below 1.
  • Invalid threshold values now use the standard fallback instead of potentially allowing unintended cleanup behavior.
  • Added coverage for zero, negative, and fractional threshold values.

• Documentation

  • Clarified that Open Charge Map is the default fallback source, while official registries are used where available in Spain and Germany.

[coderabbitai]

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ℹ️ Recent review info

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Run ID: fc819993-c8ff-4784-afca-bbf669fd22f9

📥 Commits

Reviewing files that changed from the base of the PR and between d1ac375 and d70d934.

📒 Files selected for processing (3)

• README.md
• src/scrapers/bnetza.test.ts
• src/scrapers/bnetza.ts

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📝 Walkthrough

Walkthrough

Changes

BNetzA minimum station floor validation

Layer / File(s)	Summary
Threshold validation and source documentation src/scrapers/bnetza.ts, README.md	Values below 1 now use the 10,000 default. The README identifies Open Charge Map as the fallback source.
Regression coverage src/scrapers/bnetza.test.ts	Tests cover 0.5, 0, and -3, and verify that no DELETE sweep runs.

Priority: ➖ Normal

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Bug fix

Merge Risk: ⚪ Minimal · up to d70d9

The threshold safeguard, regression coverage, and source documentation are consistent with the stated behavior, so the change is mergeable.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: keeping the BNetzA safety floor active when configured below 1.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 2…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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