docs(02-03): complete tier-2 inference platforms plan (first half)

- 7 Tier 2 providers created (Groq, Replicate, Anyscale, Together, Fireworks, Baseten, DeepInfra)
- PROV-02 marked complete

.planning/phases/02-tier-1-2-providers/02-03-SUMMARY.md

@@ -0,0 +1,97 @@
+---
+phase: 02-tier-1-2-providers
+plan: 03
+subsystem: providers
+tags: [providers, tier-2, inference-platforms, yaml]
+requires:
+  - pkg/providers/schema.go
+  - pkg/providers/loader.go (embed.FS)
+provides:
+  - Groq provider (gsk_ high-confidence)
+  - Replicate provider (r8_ high-confidence)
+  - Anyscale Endpoints provider (esecret_ high-confidence)
+  - Together AI provider (keyword + generic)
+  - Fireworks AI provider (fw_ + generic)
+  - Baseten provider (keyword + Api-Key)
+  - DeepInfra provider (keyword + generic)
+affects:
+  - registry AC automaton (7 new keyword sets)
+tech-stack:
+  added: []
+  patterns:
+    - Dual-location YAML (providers/ + pkg/providers/definitions/)
+    - RE2 regex patterns only
+    - Keyword-anchored detection for generic-key providers
+key-files:
+  created:
+    - providers/groq.yaml
+    - providers/replicate.yaml
+    - providers/anyscale.yaml
+    - providers/together.yaml
+    - providers/fireworks.yaml
+    - providers/baseten.yaml
+    - providers/deepinfra.yaml
+    - pkg/providers/definitions/groq.yaml
+    - pkg/providers/definitions/replicate.yaml
+    - pkg/providers/definitions/anyscale.yaml
+    - pkg/providers/definitions/together.yaml
+    - pkg/providers/definitions/fireworks.yaml
+    - pkg/providers/definitions/baseten.yaml
+    - pkg/providers/definitions/deepinfra.yaml
+  modified: []
+decisions:
+  - Together/Baseten/DeepInfra use low-confidence generic patterns — rely on keyword pre-filter for specificity
+  - Fireworks has two patterns (fw_ medium + generic low) to catch both historical and current key formats
+  - Baseten verify uses "Api-Key {KEY}" header (not Bearer) per provider docs
+metrics:
+  duration: ~3min
+  completed: 2026-04-05
+requirements: [PROV-02]
+---
+
+# Phase 2 Plan 3: Tier 2 Inference Platforms (First Half) Summary
+
+Created 7 Tier 2 inference platform provider YAMLs (Groq, Replicate, Anyscale, Together AI, Fireworks AI, Baseten, DeepInfra) covering high-confidence prefix patterns and keyword-anchored fallbacks for generic-key providers, dual-located for Go embed.
+
+## What Was Built
+
+**High-confidence prefixed providers (3):**
+- **Groq** — `gsk_[a-zA-Z0-9]{52}`, verify via `/openai/v1/models`
+- **Replicate** — `r8_[0-9A-Za-z\-_]{37}`, verify via `/v1/predictions`
+- **Anyscale Endpoints** — `esecret_[A-Za-z0-9_\-]{20,}`, verify via Anyscale models endpoint
+
+**Keyword-anchored providers (4):**
+- **Together AI** — 64-hex pattern (low confidence), 5 context keywords including both .xyz and .ai hosts
+- **Fireworks AI** — dual pattern: `fw_[A-Za-z0-9]{20,}` (medium) + 40+ alphanumeric (low)
+- **Baseten** — generic 40+ alphanumeric, uses `Api-Key` auth header instead of Bearer
+- **DeepInfra** — generic 32+ alphanumeric with keyword anchoring on `deepinfra`/`api.deepinfra.com`
+
+All 14 files (7 providers × 2 locations) are byte-identical across the dual locations required by Go embed.
+
+## Verification
+
+- `diff providers/$f.yaml pkg/providers/definitions/$f.yaml` — all 7 pairs byte-identical
+- `go test ./pkg/providers/... -count=1` — PASS
+- `grep -l 'tier: 2' providers/*.yaml | wc -l` — 13 (cumulative with plans 01/02)
+
+## Deviations from Plan
+
+None - plan executed exactly as written.
+
+## Commits
+
+- `a1f0b2d` — feat(02-03): add Groq, Replicate, Anyscale provider YAMLs
+- `5e36f24` — feat(02-03): add Together, Fireworks, Baseten, DeepInfra provider YAMLs
+
+## Self-Check: PASSED
+
+- providers/groq.yaml — FOUND
+- providers/replicate.yaml — FOUND
+- providers/anyscale.yaml — FOUND
+- providers/together.yaml — FOUND
+- providers/fireworks.yaml — FOUND
+- providers/baseten.yaml — FOUND
+- providers/deepinfra.yaml — FOUND
+- pkg/providers/definitions/{groq,replicate,anyscale,together,fireworks,baseten,deepinfra}.yaml — all FOUND
+- Commit a1f0b2d — FOUND
+- Commit 5e36f24 — FOUND