chore: release v0.3.0

[avrabe]

Summary

Bumps the workspace from 0.2.0 → 0.3.0 and adds a CHANGELOG.md entry for the trio runtime + Mythos fixes that landed in #108 and #109.

Status

• feat: per-resource handle tables + alias-fallback (1/3 trio runtime passes) #108 (path B + alias-fallback) — merged as 0551c06
• feat(option-A): per-component handle tables + bridging (3/3 trio passes) #109 (per-component HTs + bridging + Mythos fixes) — merged as 8d7fb8f
• Branch rebased onto post-merge main; this PR now shows ONLY the version bump and CHANGELOG.md (one commit, 3 files: Cargo.toml, Cargo.lock, CHANGELOG.md).
• Mythos delta pass complete. 5 files in scope (Tier-5: merger.rs, parser.rs; Tier-4: adapter/fact.rs, adapter/mod.rs, resolver.rs). 2 confirmed findings (LS-P-4: canonical-ABI overflow; LS-A-8: inner-list rep_func selection) — both fixed in feat(option-A): per-component handle tables + bridging (3/3 trio passes) #109 (commit f0e981b) and approved in safety/stpa/loss-scenarios.yaml.

What's in 0.3.0

Added

• Per-component handle tables for resource definers
• Trio runtime fixtures pass (closes Promote resource_floats and resource_with_lists to runtime tests #75): resource_floats, resource_with_lists, resource-import-and-export
• --opaque-rep CLI flag

Fixed (highlights)

• Borrow lower for method-like exports (no spurious callee.ht_new)
• ht_drop dtor recursion in re-exporters
• HashSet-iteration determinism in wrapper alias-fallback
• LS-P-4: canonical-ABI size saturating arithmetic on nested fixed-length-list
• LS-A-8: per-type rep_func selection for inner-list borrow<T> (was HashMap-arbitrary)

See CHANGELOG.md for the full list.

Test plan

• cargo test --release — all suites green (177 lib tests + 73 wit-bindgen runtime + integration)
• All three trio fixtures verified runtime-passing manually
• CI green on this PR
• Tag v0.3.0 after merge

Branch

release/v0.3.0 head 831fd4f — 1 commit on top of main.