feat: Ollama/gemma4 compat — /init flow, stream filter, safety fixes

provider/openai:
- Fix doubled tool call args (argsComplete flag): Ollama sends complete
  args in the first streaming chunk then repeats them as delta, causing
  doubled JSON and 400 errors in elfs
- Handle fs: prefix (gemma4 uses fs:grep instead of fs.grep)
- Add Reasoning field support for Ollama thinking output

cmd/gnoma:
- Early TTY detection so logger is created with correct destination
  before any component gets a reference to it (fixes slog WARN bleed
  into TUI textarea)

permission:
- Exempt spawn_elfs and agent tools from safety scanner: elf prompt
  text may legitimately mention .env/.ssh/credentials patterns and
  should not be blocked

tui/app:
- /init retry chain: no-tool-calls → spawn_elfs nudge → write nudge
  (ask for plain text output) → TUI fallback write from streamBuf
- looksLikeAgentsMD + extractMarkdownDoc: validate and clean fallback
  content before writing (reject refusals, strip narrative preambles)
- Collapse thinking output to 3 lines; ctrl+o to expand (live stream
  and committed messages)
- Stream-level filter for model pseudo-tool-call blocks: suppresses
  <<tool_code>>...</tool_code>> and <<function_call>>...<tool_call|>
  from entering streamBuf across chunk boundaries
- sanitizeAssistantText regex covers both block formats
- Reset streamFilterClose at every turn start

go.mod

@@ -10,6 +10,7 @@ require (
 	github.com/BurntSushi/toml v1.6.0
 	github.com/VikingOwl91/mistral-go-sdk v1.3.0
 	github.com/anthropics/anthropic-sdk-go v1.29.0
+	github.com/charmbracelet/x/ansi v0.11.6
 	github.com/openai/openai-go v1.12.0
 	golang.org/x/text v0.35.0
 	google.golang.org/genai v1.52.1
@@ -26,7 +27,6 @@ require (
 	github.com/cespare/xxhash/v2 v2.3.0 // indirect
 	github.com/charmbracelet/colorprofile v0.4.2 // indirect
 	github.com/charmbracelet/ultraviolet v0.0.0-20260205113103-524a6607adb8 // indirect
-	github.com/charmbracelet/x/ansi v0.11.6 // indirect
 	github.com/charmbracelet/x/exp/slice v0.0.0-20250327172914-2fdc97757edf // indirect
 	github.com/charmbracelet/x/term v0.2.2 // indirect
 	github.com/charmbracelet/x/termios v0.1.1 // indirect