Implement advice operators for formula composition (gt-8tmz.2)
Add Lisp-style advice operators to the formula DSL:
- before(target, step) - insert step before target
- after(target, step) - insert step after target
- around(target, wrapper) - wrap target with before/after
Features:
- Glob pattern matching for targets (*.implement, shiny.*, etc)
- Pointcut matching by type or label
- Step reference substitution ({step.id}, {step.title})
- Automatic dependency chaining
New types: AdviceRule, AdviceStep, AroundAdvice, Pointcut
New functions: ApplyAdvice, MatchGlob, MatchPointcut
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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