feat(registry): support type: path repositories

Adds a `mozart-php-serialize` crate (a byte-compatible port of PHP's
`serialize()`) and a `mozart-registry::path_repository` module that
expands `type: path` entries into synthetic `type: package`
repositories. Each synthesized package carries the same SHA-1 dist
reference Composer computes (`sha1(\$json . serialize(\$options))`)
so the lockfile and trace lines match Composer byte-for-byte.

Two latent bugs surfaced once the path-repo flow exercised real
resolutions:

- `apply_partial_update` swapped path-repo packages back to their
  locked version, defeating Composer's "path repos always reload"
  rule (`PoolBuilder` treats them as canonical, not lock-bound).
  Mirror the path-repo skip already used when constructing
  `locked_packages`.
- `normalize_root_alias_atom` returned the raw input string for
  stable numeric atoms (e.g. `1.1.1`), so the alias matcher's
  `input.version \!= alias.version_normalized` check — comparing
  against pool inputs that carry the 4-segment normalized form —
  silently never matched. Run the parsed Version through Display so
  both sides are in the same shape.

`install/update::run` gain a `path_repo_base_override: Option<&Path>`
parameter for the in-process test harness: Composer's PHPUnit
`InstallerTest::setUp` does `chdir(__DIR__)` so relative path-repo
URLs resolve against `composer/tests/Composer/Test/`, but the Rust
harness writes `composer.json` into a per-test tempdir and can't
chdir safely under parallel tests. Production callers pass `None`
and resolve against `working_dir`.

Greens 3 ignored installer fixtures:
  partial_update_loads_root_aliases_for_path_repos
  alias_in_lock
  alias_in_lock2

1 files changed, 1 insertions, 0 deletions

diff --git a/Cargo.toml b/Cargo.toml
index fcf9990..9aeca9f 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -13,6 +13,7 @@ mozart-class-map-generator = { path = "crates/mozart-class-map-generator" }
 mozart-core = { path = "crates/mozart-core" }
 mozart-console-macros = { path = "crates/mozart-console-macros" }
 mozart-metadata-minifier = { path = "crates/mozart-metadata-minifier" }
+mozart-php-serialize = { path = "crates/mozart-php-serialize" }
 mozart-registry = { path = "crates/mozart-registry" }
 mozart-sat-resolver = { path = "crates/mozart-sat-resolver" }
 mozart-semver = { path = "crates/mozart-semver" }