fix: upgrade rig-core to 0.38 and jsonschema to 0.46 with API migration

[broomva]

Summary

• Aliases rig-core as rig in workspace deps to preserve all existing use rig::... imports while upgrading from 0.36 to 0.38 (which renamed its internal lib to rig_core). The Cargo dependency alias makes rustc map --extern rig=librig_core.rlib so no source changes are needed in rig_bridge.rs.
• Bumps jsonschema from 0.18 to 0.46 in workspace deps, which contains a breaking API removal: JSONSchema::options().compile() and compiled.validate() no longer exist.
• Migrates all 4 call sites to the new API: jsonschema::compile(schema) → Validator, then validator.iter_errors(instance) for error iteration.

Files changed

File	Change
Cargo.toml	rig-core = "0.36" → rig = { package = "rig-core", version = "0.38" }; jsonschema 0.18 → 0.46
crates/arcan/arcan-provider/Cargo.toml	rig-core.workspace → rig.workspace
crates/ergon/ergon/src/agent.rs	validate_against_schema: new jsonschema 0.46 API
crates/arcan/arcan/src/agent_cmd.rs	validate_against_schema: new jsonschema 0.46 API
crates/arcan/arcan-ergon/tests/anthropic_agents_smoke.rs	assert_schema: new jsonschema 0.46 API
crates/arcan/arcan-ergon/tests/agents_fixtures.rs	each_blessed_agent_schema_compiles_under_production_validator: new API

Addresses dependabot PRs

• Closes chore(deps): bump rig-core from 0.36.0 to 0.38.2 #1752 (bump rig-core 0.36→0.38)
• Closes chore(deps): bump jsonschema from 0.18.3 to 0.46.5 #1755 (bump jsonschema 0.18→0.46)

Test plan

• cargo check -p arcan-provider — rig alias resolves correctly
• cargo check -p ergon — jsonschema 0.46 API compiles
• cargo check -p arcan — agent_cmd.rs compiles
• cargo test -p ergon — schema validation tests pass
• cargo test -p arcan-ergon — agents_fixtures schema compile test passes
• CI Gates 1–3 (format, lint, test) green

🤖 Generated with Claude Code

https://claude.ai/code/session_01XqadKZDEB6J9WAAmuVkmoV

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