Add FastMetal execution, Jev routing and free MCP discovery

[copyleftdev]

Braess can now execute fixed routes through FastMetal and use FastMetal-hosted Jev for routing decisions. The new braess-fastmetal companion shares the existing bounded generation engine, durable reservations and image-reference checks with OpenRouter. It preserves uncertain attempts without retries and records reported costs separately in JPY.

braess-fastmetal-discover adds optional, free MCP discovery: initialization, tool enumeration, model pricing/capabilities, selected-model details and sanitized balances. Private, create-only snapshots have timestamps and bounded response sizes, deadlines and pagination. Discovery never changes routes or invokes paid MCP tools.

• Keep existing OpenRouter wire and journal defaults; add explicit FastMetal backend and credential selection.
• Pin the observed FastMetal Jev response version and reject oversized encoded decision requests before reserving calls.
• Include sanitized contract fixtures, setup examples, failure tests and both new binaries in Cargo packaging and CI evidence.
• Update the optional image decoder to Pillow 12.3.0, the patched version for the 18 reported dependency advisories; verify all 144 showcase tests against that pin.
• Give the catalog correctness fixture time for durable journal writes while preserving dedicated short-deadline tests.
• Bump the unreleased version to 0.1.0-alpha.8.

Validation: all 15 offline validation stages and sealed-evidence verification passed; 96 Rust tests and 144 discovery-showcase tests passed; strict Clippy, Cargo package verification, version policy and Gitleaks passed. Focused live synthetic calls verified chat/image/reasoning/structured/tool/stream shapes, Jev decisions, the generation binary and the discovery binary. Live MCP returned 85 models and 12 tools. Total account spend after these experiments was approximately ¥0.10544; free MCP checks did not increase it.

Scope: generation remains non-streaming and has no tool execution loop. The companion offers JSON-object output, not a JSON-schema interface. MCP metadata is an observation, not an automatic routing policy or a guarantee of provider behavior. Existing USD demo accounting is not extended to JPY. No package publication or deployment is included.

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Reviewing files that changed from the base of the PR and between cf7bbc2 and 71c64c2.

⛔ Files ignored due to path filters (1)

• Cargo.lock is excluded by !**/*.lock

📒 Files selected for processing (36)

• CHANGELOG.md
• Cargo.toml
• README.md
• config/fastmetal.live.example.json
• config/gateway.fastmetal.live.example.json
• demo/requirements-media.txt
• docs/FASTMETAL.md
• eval/fastmetal-rubric.json
• scripts/fastmetal_discovery_e2e.py
• scripts/fastmetal_e2e.py
• scripts/gateway_catalog_e2e.py
• scripts/validate_local.py
• scripts/verify_evidence.py
• src/bin/braess-fastmetal-discover.rs
• src/bin/braess-fastmetal.rs
• src/bin/braess-openrouter.rs
• src/bin/braess-router.rs
• src/fastmetal.rs
• src/fastmetal/discovery.rs
• src/fastmetal/discovery/fixtures/catalog.json
• src/fastmetal/discovery/fixtures/initialize.json
• src/fastmetal/discovery/fixtures/model.json
• src/fastmetal/discovery/tests.rs
• src/gateway.rs
• src/generation/fixtures/fastmetal-reasoning.json
• src/generation/fixtures/fastmetal-structured.json
• src/generation/fixtures/fastmetal-text.json
• src/generation/fixtures/fastmetal-tool.json
• src/generation/fixtures/fastmetal-vision.json
• src/generation/journal.rs
• src/generation/mod.rs
• src/generation/server.rs
• src/generation/tests.rs
• src/generation/vision.rs
• src/lib.rs
• src/openrouter.rs

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