feat(llamaswap): add llama-swaps (TLS) DSN scheme

llama-swap was http-only by DSN, pushing TLS-fronted instances onto the openai://
scheme (which loses the management/image methods). Add a "llama-swaps" scheme
that builds an https base URL, alongside "llama-swap" (http, local-first) —
mirroring redis/rediss. Both share one factory; llama-swaps is scheme-only (no
default built-in). The choice stays explicit because a DSN has no reliable
http-vs-https signal.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

progress.md

@@ -1,5 +1,12 @@
 # progress
 
+## 2026-06-27 — llama-swaps (TLS) DSN scheme
+
+Follow-up to the llama-swap provider: added the `llama-swaps` DSN scheme (https
+base URL) alongside `llama-swap` (http, local-first), mirroring redis/rediss, so
+a TLS-fronted instance is first-class instead of being pushed to the `openai://`
+scheme. Scheme-only (no default built-in); shares one factory in builtin.go.
+
 ## 2026-06-27 — llama-swap provider + canonical image-gen interface
 
 **Landed (ADR-0015, ADR-0016).** New `provider/llamaswap`: chat **delegates to