fix(resolver): strip inline #ref and gate alias trace on alias stability

Two related parity gaps surfaced by the `alias-with-reference` fixture:

1. A root require like `dev-main#abcd as 1.0.0` left the SAT-side
   constraint as `dev-main#abcd`, which no candidate matched, so
   resolution failed before the alias could be materialized. Mirror
   Composer's `extractAliases` regex (which captures only the
   constraint up to `#`) and `RootPackageLoader::extractReferences`
   (which records the hash separately): drop the trailing `#hex` from
   the resolver-side constraint and from the alias's left-hand side.
   Lockfile generation already pulls the reference back out of the
   raw require map for the post-resolve override.

2. `MarkAliasInstalled`'s trace line gated the reference suffix on
   the *target* package's stability, so a stable alias like `1.0.0`
   pointing at a dev-branch target rendered as `1.0.0 abcd`. Mirror
   `AliasPackage::getFullPrettyVersion`: the alias decides on its own
   whether to append the suffix based on its own normalized version,
   so a stable alias skips the suffix even when the target is dev.

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