Remove redundant Pennant guidelines

[pushpak1300]

When we first added skill support, skill triggering wasn't reliable enough, so we added a core.blade.php guideline that duplicated instructions already in the Pennant skill — things like "always use search-docs" and "activate pennant-development for Pennant tasks". This burned extra context tokens on every request.

We now have an eval system for testing and improving skill descriptions, so they trigger reliably. This means the redundant guideline file is no longer needed.

Approach

• Remove the redundant core.blade.php guideline that duplicated the Pennant skill's own instructions
• Refine the skill description to be more specific about Laravel Pennant scoping, validated through trigger evals

[pushpak1300]

This is the result of the benchmarks.

Aspect	Original Description	Final Description
Format	Activates when... / or when...	Use when... Trigger whenever... Common tasks... Also trigger... Do not trigger...
Test Score	8/20 (40% pass rate)	~16/20 (80% pass rate)
Key Improvement	Failed to trigger on legitimate Pennant queries	Explicitly mentions Pennant by name + expanded common tasks
Length	Shorter, concise	Longer, more comprehensive
Trigger Keywords	"feature flags", "feature toggles", "@feature directive"	"Pennant" (by name) + all previous + class-based features, middleware, events, custom drivers, canary releases, dark launches
Negative Guidance	None	Explicitly excludes generic config, auth policies, authentication