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>

CLAUDE.md

@@ -79,12 +79,13 @@ alias   := bare token (no slash), expands INLINE, recursively, cycle-checked
 `LLM_<NAME>=scheme://[token@]host[/path]` — e.g.
 `LLM_M5=foreman://token@foreman-m5.example` defines provider `m5`; then
 `m5/qwen3:30b` works in Parse, chains, and aliases. Scheme ∈ {foreman,
-ollama, ollama-cloud, openai, anthropic, google, gemini, llama-swap} ∪
-RegisterScheme. Token = credential; base URL = `https://host` always —
-**except `llama-swap`, which builds `http://host` (local-first; ADR-0015).**
-`New()` scans the process env eagerly; unknown names also resolve lazily at
-Parse time (`my-prov` → `LLM_MY_PROV`). Malformed entries fail on use, not at
-startup.
+ollama, ollama-cloud, openai, anthropic, google, gemini, llama-swap,
+llama-swaps} ∪ RegisterScheme. Token = credential; base URL = `https://host`
+always — **except `llama-swap`, which builds `http://host` (local-first);
+`llama-swaps` is its TLS twin (`https://host`), mirroring redis/rediss
+(ADR-0015).** `New()` scans the process env eagerly; unknown names also resolve
+lazily at Parse time (`my-prov` → `LLM_MY_PROV`). Malformed entries fail on use,
+not at startup.
 
 ## Health & failover (ADR-0006, ADR-0008)