v0.2 scaffold: vendor clawdforge SDK + forge module + Whisper plan

The Rust SDK already existed at Sulkta-Coop/clawdforge clients/rust/ — async,
reqwest-based, bearer-auth, exposes Client::run() + Session for multi-turn.
Vendoring it into vendor/clawdforge so skald is self-contained: no
git-submodule + no needing the clawdforge repo cloned next to skald.
Trade-off accepted: updates require manual re-copy until both sides
stabilize and we publish to a private cargo registry.

What landed:

- vendor/clawdforge/ — full SDK source from Sulkta-Coop/clawdforge HEAD.
  Pinned in skald-core/Cargo.toml as a path dep.
- skald-core/src/forge.rs — three-pass orchestration shell. Forge wraps
  clawdforge::Client; generate() / cleanup() / audit() each build a
  RunRequest with the right system prompt + model alias (always opus),
  call client.run(), return a PassOutput.
  Prompt templates are TODO stubs (SYSTEM_GEN_TODO etc) — filling in the
  actual prose-craft prompts is its own deep session.
- skald-core/src/config.rs — ForgeConfig { base_url, app_token, model }.
  Resolved by the binary from env (CLAWDFORGE_URL + CLAWDFORGE_TOKEN);
  lib stays env-agnostic.
- skald-core::AuditFinding + AuditResponse — parse shape for what the
  third-Opus canon audit returns, ready to map onto audit_findings rows.
- docs/tts-pipeline.md — full plan for v0.2 narration + post-TTS audit
  chain. Whisper-large-v3 STT does text-to-text verification on every
  render; an optional Gemini Flash audio pass catches subjective issues
  (prosody, tone) Whisper can't see. Reroll loop on crit findings.

What's still stubbed:

- Prompt templates in forge.rs (gen / cleanup / audit) — placeholders
  that describe the role but don't constrain output shape yet.
- context.rs (assemble the LLM context blob from DB rows) — entire module
  TBD.
- No CLI subcommand yet for invoking forge — that comes after context.rs.

Naming note: in Rust 2024 'gen' is a reserved keyword (for generators),
so the method is Forge::generate(), not Forge::gen().

README.md

@@ -20,13 +20,24 @@ What's wired:
 - `skald serve` exposes `/health` and runs migrations on boot
 - Single-container deploy: postgres + skald in one image
 
+Wired (this commit):
+
+- clawdforge Rust SDK vendored at `vendor/clawdforge/` (upstream:
+  `Sulkta-Coop/clawdforge` `clients/rust/`)
+- `skald-core::forge` — three-pass orchestration shell (gen / cleanup /
+  audit). Prompts are TODO stubs; pipeline plumbing is in place.
+
 Not yet wired:
 
 - Web UI (the inbox + browse + queue surface)
-- clawdforge calls (the actual generate / cleanup / canon-audit
-  pipeline)
-- Embeddings + similarity search
-- TTS sidecar
+- Prompt templates for the three passes (heavy prompt-engineering
+  work — own session)
+- `skald-core::context` — assemble the LLM context blob from DB rows
+  (bible + characters + parent prose summaries + similarity-matched
+  passages)
+- Embeddings backfill + ivfflat index
+- TTS sidecar container + post-render audit chain (see
+  `docs/tts-pipeline.md`)
 
 ## v0.1 smoke