Keep scheduled workflows enabled through quiet periods

[imanimanyara]

GitHub disables a public repository's scheduled workflows after 60 days
without a push, and says nothing. In 2026-09 that silently stopped CodeQL
on two repositories that were finished rather than abandoned. This adds a
weekly caller of laranail/.github's reusable keepalive, which re-enables
every workflow that is active or was disabled for inactivity, itself
included. Re-enabling resets the clock; no commits are made. Workflows a
human disabled are left alone.

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[github-actions]

Benchmark results

Scenario	Optimizations	Native Laravel	Optimized	Speedup	Δ vs base
Product import — 500 items, simple rules	Wildcard, fast-check	196.9ms	3.5ms	~56x	-42%
Nested order lines — 1000 orders × 5 line items	Wildcard, fast-check (nested)	950.5ms	20.8ms	~46x	-8%
Event scheduling — 100 items, field-ref dates	Wildcard, partial fast-check	34.6ms	1.4ms	~25x	+0%
Article submission — 50 items, custom Rule objects	Wildcard only	11.3ms	3.3ms	~3x	+3%
Conditional import — 100 items, 47 conditional fields	Wildcard, pre-evaluation	256.2ms	55.7ms	~5x	-0%
Login form — 3 fields, no wildcards	Fast-check (flat)	0.2ms	0.0ms	~10x	—