fix: don't flag Kotlin delegation/destructuring imports as unused

[tallclouds]

Problem

Kotlin resolves some imports by convention rather than by name, so the imported symbol never appears in the file body. The most common case is property delegation:

import androidx.compose.runtime.getValue
import androidx.compose.runtime.setValue
...
var expanded by remember { mutableStateOf(false) }

getValue/setValue are required for by to compile, but neither name is ever written out. detect_unused_imports does a plain identifier search, so it reports both as unused in every Compose file.

$ desloppify scan --path .   # Compose Multiplatform project
...
Remove 73 unused issues
  - Unused import: getValue
  - Unused import: setValue

37 of those 73 findings were this false positive — over half the detector's output for that language. Acting on them breaks the build:

e: ... 'getValue' operator is required for delegation

Destructuring has the same shape: val (lat, lon) = point calls component1()/component2() without naming them.

Fix

Adds TreeSitterLangSpec.implicit_import_uses — a tuple of (name_pattern, body_pattern) pairs. When an import's simple name matches name_pattern and body_pattern is found in the file body, the import counts as used.

Kotlin declares two conventions:

• getValue|setValue|provideDelegate, guarded on the by keyword
• componentN, guarded on a destructuring declaration

The guards matter: an unused getValue import in a file with no delegation is still reported, so real dead imports aren't hidden. The (?<![\w.]) lookbehind keeps identifiers like nearby from masking them.

The field defaults to (), so every other language is unaffected. The lookup uses getattr so duck-typed spec stubs in the existing tests keep working.

Verification

• New regression tests in desloppify/tests/lang/common/test_kotlin_unused_imports.py (5 cases, covering both the false positives and the negative cases that must still be flagged).
• Full suite: 5816 passed, 4 skipped.
• Against the original project: the 37 false positives drop to 0, while the 35 genuinely-unused imports in the same codebase are still reported.

🤖 Generated with Claude Code

https://claude.ai/code/session_01PCWKUYMUFfgPFW9brzaPVn