feat(pyproject): release v1.7.0 — Python pyproject.toml version bump

Add internal/pyproject package with ReadVersion and WriteVersion for
pyproject.toml files. Reads [project].version (PEP 621) first, then
falls back to [tool.poetry].version. Section boundaries are detected
via TOML's rule that headers always start at the beginning of a line
(\n[ pattern), so inline arrays with [ characters don't interfere.

Config follows the established multi-value pattern:
- python.pyproject_toml: single path (opt-in, no default)
- python.pyproject_tomls: list for monorepos (overrides single)
- --pyproject flag overrides pyproject_toml and clears pyproject_tomls

100% per-package statement coverage maintained across all 14 packages;
FuzzReadVersion and FuzzWriteVersion added per fuzzing guidelines.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

CLAUDE.md

@@ -62,6 +62,7 @@ All seed cases must pass. The table below is authoritative — keep it in sync w
 | `internal/changelog` | `FuzzUpdate` | rewrites arbitrary existing file content |
 | `internal/commits` | `FuzzParse` | parses arbitrary commit message strings |
 | `internal/gradle` | `FuzzReadVersion`, `FuzzWriteVersion` | reads/rewrites arbitrary Gradle build file content |
+| `internal/pyproject` | `FuzzReadVersion`, `FuzzWriteVersion` | reads/rewrites arbitrary pyproject.toml content |
 | `internal/glclient` | `FuzzEncodeProjectPath` | encodes arbitrary project path strings |
 | `internal/maven` | `FuzzReadVersion`, `FuzzReplaceProjectVersion` | reads/rewrites arbitrary XML file content |
 | `internal/node` | `FuzzReadVersion`, `FuzzWriteVersion` | reads/rewrites arbitrary JSON file content |