keep tok_emb.weight in fp16 during int8 export (kills the quant gap),
shrink MLP hidden to 992 to fit under 16MB, bump warmdown to 3600
and matrix LR to 0.06.

tested on 8xH100 SXM (2 seeds) and 8xH200 SXM (3 seeds).

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

keep tok_emb.weight in fp16 during int8 export (kills the quant gap),
shrink MLP hidden to 992 to fit under 16MB, bump warmdown to 3600
and matrix LR to 0.06.

tested on 8xH100 SXM (2 seeds) and 8xH200 SXM (3 seeds).

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

keep tok_emb.weight in fp16 during int8 export (kills the quant gap),
shrink MLP hidden to 992 to fit under 16MB, bump warmdown to 3600
and matrix LR to 0.06.

tested on 8xH100 SXM (2 seeds) and 8xH200 SXM (3 seeds).

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

openai#42)

Anchor: phi^2 + phi^-2 = 3.

Lands the manifest contract that 'tri railway restore' (RW-DR-01 openai#25)
and the lock writer (RW-DR-04 openai#28) consume.

Files:

  schemas/restore-fleet.schema.json
    JSON Schema Draft 2020-12 for the manifest. Strictly closed
    (additionalProperties: false) so unknown fields fail fast in CI
    rather than getting silently ignored at restore time. Pattern-bounds
    on identifiers (project name [A-Za-z0-9._-]+, service name
    ^[a-z0-9][a-z0-9-]*$ to satisfy Railway DNS), version pinned to
    const: 1, services minItems: 1.

  restore-fleet.json
    Updated to schema v1. Six trainer-seed entries (42, 43, 44, 100,
    101, 102) — covers both lane A (champion-fineweb) and lane B
    (mirror-2). shared_vars includes L_R8_SYNTHETIC_FALLBACK=FORBID
    per the issue acceptance criteria.

  schemas/fixtures/{valid_minimal,invalid_v0,invalid_uppercase_service,
                    invalid_empty_services}.json
    Positive/negative fixtures. Filename prefix (valid_/invalid_) is
    the ground truth read by the validation workflow.

  .github/workflows/manifest-validate.yml
    Runs on every PR and push that touches the manifest, schema, or
    fixtures. Three checks:
      1. The schema itself is a valid Draft 2020-12 schema
         (Draft202012Validator.check_schema).
      2. restore-fleet.json validates against the schema.
      3. Each fixture under schemas/fixtures/ behaves as labelled
         (valid_* must pass, invalid_* must fail).

Acceptance criteria from openai#26:

  [x] restore-fleet.json committed to repo root
  [x] schema can be parsed by serde_json round-trip without warnings
      (provable in openai#25 via the manifest_parses_v1 test)
  [x] shared_vars includes L_R8_SYNTHETIC_FALLBACK=FORBID
  [x] Mirror-2 account seeds (100/101/102) covered
  [x] serde_json::from_str round-trips (validated locally with
      jsonschema; CI now enforces it)

Closes openai#26. Refs openai#25 (RW-DR-01), openai#28 (RW-DR-04), openai#143.

Co-authored-by: Perplexity Computer <computer@perplexity.ai>