feat: inject effort as soft default via CLI flags instead of env var (#104)

CLAUDE_CODE_EFFORT_LEVEL hard-locks effort for the whole session and makes
Claude reject in-session /effort switching (incl. ultracode). Carry effort
as a dedicated payload field instead, injected at spawn as a soft default:

- regular levels (incl. max) -> claude --effort <level>
  (the settings effortLevel key is enum([low,medium,high,xhigh]) with
  .catch(undefined), so max would be silently dropped there)
- ultracode -> claude --settings '{"ultracode":true}'
  (dedicated boolean settings key, rejected by the --effort flag)

Changes:
- add effort enum field to create/quick-start/ralph-loop schemas and thread
  it through Session -> CreateSessionOptions/RespawnPaneOptions -> spawn
- buildEffortCliArgs() in session-cli-builder, shared by tmux spawn command
  and direct-PTY fallback args
- frontend: buildEnvOverrides() no longer emits CLAUDE_CODE_EFFORT_LEVEL;
  validated effort goes into payloads via getEffortSetting()
- settings UI: add Ultracode option to the Thinking Effort dropdown
- legacy migration: Session constructor extracts CLAUDE_CODE_EFFORT_LEVEL
  from persisted envOverrides; applyEnvOverrides() unsets the stale tmux
  session var so respawned panes are no longer locked
- tests: test/effort-injection.test.ts (13 cases)

Co-authored-by: Teigen <teigenzhang@gmail.com>

src/web/schemas.ts

@@ -80,6 +80,15 @@ const safeEnvOverridesSchema = z
     }
   );
 
+// ========== Effort Level ==========
+
+/**
+ * Claude CLI effort level for new sessions. Injected as a `--settings` soft default
+ * (NOT the CLAUDE_CODE_EFFORT_LEVEL env var, which would hard-lock the session and
+ * block in-session `/effort` switching). `ultracode` enables dynamic workflow orchestration.
+ */
+const effortLevelSchema = z.enum(['low', 'medium', 'high', 'xhigh', 'max', 'ultracode']).optional();
+
 // ========== Session Routes ==========
 
 /**
@@ -124,6 +133,8 @@ export const CreateSessionSchema = z.object({
   mode: z.enum(['claude', 'shell', 'opencode']).optional(),
   name: z.string().max(100).optional(),
   envOverrides: safeEnvOverridesSchema,
+  /** Claude CLI effort level (soft default via --settings, switchable in-session via /effort) */
+  effort: effortLevelSchema,
   /** Model override to write to .claude/settings.local.json (e.g., "opus[1m]"). Empty string clears. */
   modelOverride: z.string().max(50).optional(),
   openCodeConfig: OpenCodeConfigSchema,
@@ -179,6 +190,8 @@ export const QuickStartSchema = z.object({
   mode: z.enum(['claude', 'shell', 'opencode']).optional(),
   openCodeConfig: OpenCodeConfigSchema,
   envOverrides: safeEnvOverridesSchema,
+  /** Claude CLI effort level (soft default via --settings, switchable in-session via /effort) */
+  effort: effortLevelSchema,
 });
 
 // ========== Hook Events ==========
@@ -543,6 +556,8 @@ export const RalphLoopStartSchema = z.object({
   maxIterations: z.number().int().min(0).max(1000).nullable().default(10),
   enableRespawn: z.boolean().default(false),
   envOverrides: safeEnvOverridesSchema,
+  /** Claude CLI effort level (soft default via --settings, switchable in-session via /effort) */
+  effort: effortLevelSchema,
   planItems: z
     .array(
       z.object({