feat: project resolver + pattern infrastructure

[polymorcodeus]

Staging for next release

Changes:

• internal/resolver - ResolveProjectID(ctx, dir) reads origin via git remote get-url origin and
  NormalizeRemoteURL strips scheme/auth/port, normalizes SSH host:path to host/path , strips .git , and lowercases.
• internal/patterns - Load reads .lnkinclude (missing file = empty list); Match inverts go-gitignore semantics
  so a match means include.
• Match uses gitignore.ParsePattern + gitignore.NewMatcher , splitting paths on / and checking both file and
  directory interpretations.
• Added go-git/go-git/v5/plumbing/format/gitignore dependency.
• Unit tests cover URL normalization matrix, local repo without origin, pattern include/exclude/negation, last-match-
  wins, ** , ?, directory patterns, and character classes.