feat: rebrand as Hermit — TUI palette, dual glyphs, binary 0.10.0

Ship hermit binary (cst-agent symlink), ~/.config/hermit with legacy fallback,
Hermit color theme and mini crab frames, plus SVG→PUA font build pipeline.

Co-authored-by: Cursor <cursoragent@cursor.com>

include/cst_hermit_glyph.h

@@ -0,0 +1,63 @@
+#ifndef CST_HERMIT_GLYPH_H
+#define CST_HERMIT_GLYPH_H
+
+#include <stddef.h>
+#include <wchar.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Product display name (user-visible). Binary install name is "hermit". */
+#define HERMIT_NAME "Hermit"
+#define HERMIT_BIN "hermit"
+#define HERMIT_LEGACY_BIN "cst-agent"
+#define HERMIT_CONFIG_DIR "hermit"
+#define HERMIT_LEGACY_CONFIG_DIR "cst-agent"
+
+/* Icon states mirror icons/agent-motion SVG set. */
+typedef enum {
+  HERMIT_ST_IDLE = 0,
+  HERMIT_ST_QUESTION,
+  HERMIT_ST_THINKING,
+  HERMIT_ST_CODING,
+  HERMIT_ST_SUCCESS,
+  HERMIT_ST_ERROR,
+  HERMIT_ST_N
+} hermit_state_t;
+
+typedef enum {
+  HERMIT_ICON_AUTO = 0,
+  HERMIT_ICON_MINI,
+  HERMIT_ICON_FONT
+} hermit_icon_mode_t;
+
+/* HERMIT_<SUFFIX> then CST_<SUFFIX>. Never returns NULL (may be ""). */
+const char *hermit_getenv(const char *suffix);
+
+hermit_icon_mode_t hermit_icon_mode(void);
+/* Effective mode after AUTO resolution (ascii forces MINI). */
+hermit_icon_mode_t hermit_icon_mode_eff(int ascii);
+
+/* Small badge UTF-8 (or ASCII). frame advances animation. */
+const char *hermit_mini_badge(hermit_state_t st, int frame, int ascii);
+
+/* Home shell crab: up to *nlines strings (not owned). Returns line count. */
+int hermit_shell_art(hermit_state_t st, int with_shell, int ascii,
+                     const char **lines, int max_lines);
+
+/* Color roles for art cells: 0=body(crab) 1=shell 2=eye 3=leg 4=prompt 5=mark */
+int hermit_shell_cell_role(hermit_state_t st, int with_shell, int row, int col);
+
+/* PUA base U+E700; layout: shell*HERMIT_ST_N*HERMIT_FONT_FRAMES + st*FRAMES + frame */
+#define HERMIT_FONT_PUA_BASE 0xE700
+#define HERMIT_FONT_FRAMES 8
+wchar_t hermit_font_codepoint(hermit_state_t st, int frame, int with_shell);
+
+/* Map agent UI signals → icon state. */
+hermit_state_t hermit_state_from_ui(int busy, int ask, int error);
+
+#ifdef __cplusplus
+}
+#endif
+#endif