refactor: migrate handoff, notes, mcp, subagent, recall, anchors to .codewhale

- HANDOFF_RELATIVE_PATH → .codewhale/handoff.md with .deepseek fallback
- load_handoff_block reads both paths, prefers .codewhale
- ToolContext notes_path and mcp_config_path use resolve_project_state_dir
- Sub-agent state path prefers .codewhale/state/
- Cycle archive (recall_archive) uses resolve_state_dir for sessions
- Compaction anchors path prefers .codewhale/anchors.md
- Updated marker constants and comments

Part of #2231.

crates/tui/src/compaction.rs

@@ -1032,7 +1032,13 @@ fn read_workspace_anchors(workspace: Option<&Path>) -> Vec<String> {
         return Vec::new();
     };
 
-    let anchors_path = ws.join(".deepseek").join("anchors.md");
+    // Prefer .codewhale, fall back to .deepseek
+    let primary = ws.join(".codewhale").join("anchors.md");
+    let anchors_path = if primary.exists() {
+        primary
+    } else {
+        ws.join(".deepseek").join("anchors.md")
+    };
     let Ok(content) = std::fs::read_to_string(anchors_path) else {
         return Vec::new();
     };

crates/tui/src/prompts.rs

@@ -53,7 +53,9 @@ impl Default for PromptSessionContext<'_> {
 /// A previous session writes it on exit / `/compact`; the next session reads
 /// it back on startup and prepends it to the system prompt so a fresh agent
 /// doesn't have to re-discover open blockers from scratch.
-pub const HANDOFF_RELATIVE_PATH: &str = ".deepseek/handoff.md";
+pub const HANDOFF_RELATIVE_PATH: &str = ".codewhale/handoff.md";
+/// Legacy handoff path for reading from existing installs.
+const LEGACY_HANDOFF_RELATIVE_PATH: &str = ".deepseek/handoff.md";
 
 /// Per-file size cap for `instructions = [...]` entries (#454). Mirrors
 /// the existing project-context cap in `project_context::load_context_file`
@@ -180,7 +182,12 @@ fn render_instructions_block(paths: &[PathBuf]) -> Option<String> {
 /// system-prompt block. Returns `None` when the file is absent or empty so
 /// callers can keep the default-uncluttered prompt for fresh workspaces.
 fn load_handoff_block(workspace: &Path) -> Option<String> {
-    let path = workspace.join(HANDOFF_RELATIVE_PATH);
+    let primary = workspace.join(HANDOFF_RELATIVE_PATH);
+    let path = if primary.exists() {
+        primary
+    } else {
+        workspace.join(LEGACY_HANDOFF_RELATIVE_PATH)
+    };
     let raw = std::fs::read_to_string(&path).ok()?;
     let trimmed = raw.trim();
     if trimmed.is_empty() {
@@ -373,7 +380,7 @@ pub const SUGGEST_APPROVAL: &str = include_str!("prompts/approvals/suggest.md");
 pub const NEVER_APPROVAL: &str = include_str!("prompts/approvals/never.md");
 
 /// Compaction relay template — written into the system prompt so the
-/// model knows the format to use when writing `.deepseek/handoff.md`.
+/// model knows the format to use when writing `.codewhale/handoff.md`.
 pub const COMPACT_TEMPLATE: &str = include_str!("prompts/compact.md");
 
 /// Memory hygiene guidance — appended to the system prompt only when the
@@ -741,7 +748,7 @@ pub fn system_prompt_for_mode_with_context_skills_session_and_approval(
     }
 
     // 5. Compaction relay template — so the model knows the format to use
-    //    when writing `.deepseek/handoff.md` on exit / `/compact`.
+    //    when writing `.codewhale/handoff.md` on exit / `/compact`.
     full_prompt.push_str("\n\n");
     full_prompt.push_str(COMPACT_TEMPLATE);
 
@@ -832,7 +839,7 @@ mod tests {
 
     /// Discriminator unique to the injected relay block (not present in the
     /// agent prompt's own discussion of the convention).
-    const HANDOFF_BLOCK_MARKER: &str = "left a relay artifact at `.deepseek/handoff.md`";
+    const HANDOFF_BLOCK_MARKER: &str = "left a relay artifact at `.codewhale/handoff.md`";
 
     fn contains_cjk(text: &str) -> bool {
         text.chars().any(|ch| {

crates/tui/src/tools/recall_archive.rs

@@ -162,11 +162,10 @@ fn archive_root(session_id: &str) -> Result<PathBuf, std::io::Error> {
             "Could not resolve home directory for cycle archive root",
         )
     })?;
-    Ok(home
-        .join(".deepseek")
-        .join("sessions")
-        .join(session_id)
-        .join("cycles"))
+    // Use resolved sessions dir (prefers ~/.codewhale/sessions)
+    let sessions = codewhale_config::resolve_state_dir("sessions")
+        .unwrap_or_else(|_| home.join(".deepseek").join("sessions"));
+    Ok(sessions.join(session_id).join("cycles"))
 }
 
 /// Enumerate all archive files for a session, sorted by cycle number ascending.

crates/tui/src/tools/spec.rs

@@ -183,8 +183,9 @@ impl ToolContext {
     pub fn new(workspace: impl Into<PathBuf>) -> Self {
         let workspace = workspace.into();
         let shell_manager = new_shared_shell_manager(workspace.clone());
-        let notes_path = workspace.join(".deepseek").join("notes.md");
-        let mcp_config_path = workspace.join(".deepseek").join("mcp.json");
+        // Prefer .codewhale, fall back to .deepseek for project-local state
+        let notes_path = codewhale_config::resolve_project_state_dir(&workspace, "notes.md").1;
+        let mcp_config_path = codewhale_config::resolve_project_state_dir(&workspace, "mcp.json").1;
         Self {
             workspace,
             shell_manager,

crates/tui/src/tools/subagent/mod.rs

@@ -1845,6 +1845,11 @@ async fn subagent_session_projection(
 }
 
 fn default_state_path(workspace: &Path) -> PathBuf {
+    // Prefer .codewhale, fall back to .deepseek for project-local state
+    let primary = workspace.join(".codewhale").join("state");
+    if primary.exists() {
+        return primary.join(SUBAGENT_STATE_FILE);
+    }
     workspace
         .join(".deepseek")
         .join("state")