fix(registry): fi in IGNORED_PREFIXES shadows find commands

[hoklims]

Summary

• "fi" (shell keyword for ending if blocks) was listed as a bare string in IGNORED_PREFIXES
• "find".starts_with("fi") is true, so all find commands were classified as Ignored
• This meant rtk rewrite "find ..." always returned exit 1 (no rewrite), making the hook system unable to intercept find commands
• Same issue affected "done" which could shadow hypothetical commands starting with done

Fix

• Move "fi" and "done" from IGNORED_PREFIXES to IGNORED_EXACT (exact match only)
• Both copies of these constants in registry.rs are fixed
• Added 3 regression tests: find is now Supported, bare fi and done remain Ignored

Root cause analysis

IGNORED_PREFIXES check (line ~310):
  for prefix in IGNORED_PREFIXES {
      if trimmed.starts_with(prefix) {  // "find ...".starts_with("fi") == true!
          return Classification::Ignored;
      }
  }
  // Never reaches REGEX_SET matching for find commands

Other shell keywords like then, else, do already used the "keyword\n" / "keyword " suffix pattern to avoid this. fi and done were the only bare entries without a trailing delimiter.

Test plan

• cargo test — 416 passed, 0 failed
• rtk rewrite "find . -name foo" → rtk find . -name foo (was exit 1 before)
• rtk rewrite "git status" → rtk git status (no regression)
• rtk rewrite "ls -la" → rtk ls -la (no regression)

Partially fixes #170, #204, #236 — those issues reported find failures due to flag syntax mismatch, but the deeper blocker was that find was never classified as supported in the first place.

[Copilot]

Pull request overview

Fixes a command-classification bug in the discovery registry where shell keywords in the ignored prefix list caused unrelated commands (notably find) to be incorrectly classified as Ignored, preventing rewrite/hook interception.

Changes:

• Moves fi and done from IGNORED_PREFIXES (prefix match) to IGNORED_EXACT (exact match) to avoid shadowing commands like find.
• Adds regression tests ensuring find ... is classified as Supported while bare fi / done remain Ignored.

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