diff --git a/.zsh/aliases.zsh b/.zsh/aliases.zsh
index 6e032ec..a670bdc 100644
--- a/.zsh/aliases.zsh
+++ b/.zsh/aliases.zsh
@@ -31,12 +31,7 @@ alias kca="knowledge-crystallize.sh --all"        # Stamp all projects at once
 alias dch="diff-check.sh"                         # Detect drift between repo and ~/.dotfiles
 alias cl="changelog-gen.sh"                       # Regenerate CHANGELOG.md from git log
 
-# Aider tiers (OpenRouter) — sunset planned in PR2, kept here during PR1 coexistence (see ADR-009 / spec AI-011)
-alias ai="aider"                                                                          # daily: DeepSeek V3.2
-alias aic="aider --model openrouter/qwen/qwen3-coder-next"                                # coding: Qwen3 Coder
-alias aia="aider --architect --model openrouter/deepseek/deepseek-v3.2-speciale"           # architecture: DeepSeek Speciale
-
-# OpenCode (secondary AI coding agent — replaces aider after PR2)
+# OpenCode (primary AI coding agent — replaces aider)
 alias oc="opencode"                                                                       # TUI: opencode Go subscription
 
 # tmux session management
diff --git a/AGENTS.md b/AGENTS.md
index f707797..1b20b5a 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -2,7 +2,7 @@
 
 > **Single Source of Truth for AI coding agents in this repo.**
 >
-> Claude Code, OpenCode, Copilot, Cursor, Codex, Gemini, and Aider all read this file as their canonical system prompt. Per-agent files in `ai/<agent>/` and `.github/` are thin pointers that delegate here, retaining only agent-specific extensions. See [`30-architecture/adr-009-multi-agent-runtime`](https://github.com/mlorentedev/dotfiles) (in vault) for the rationale.
+> Claude Code, OpenCode, Copilot, Cursor, Codex, and Gemini all read this file as their canonical system prompt. Per-agent files in `ai/<agent>/` and `.github/` are thin pointers that delegate here, retaining only agent-specific extensions. See [`30-architecture/adr-009-multi-agent-runtime`](https://github.com/mlorentedev/dotfiles) (in vault) for the rationale.
 
 ## Identity
 
diff --git a/ai/aider/aider.conf.yml b/ai/aider/aider.conf.yml
deleted file mode 100644
index 4f1d80a..0000000
--- a/ai/aider/aider.conf.yml
+++ /dev/null
@@ -1,32 +0,0 @@
-# Aider global configuration
-# Deployed to ~/.aider.conf.yml by setup scripts
-# Docs: https://aider.chat/docs/config/aider_conf.html
-
-# Default tier: DeepSeek V3.2 (70% aider polyglot, ~$0.40/month)
-# OPENROUTER_API_KEY is exported by load-secrets.sh at shell startup
-#
-# 3 tiers available (budget ~$2/month):
-#   daily (default):  aider
-#   coding:           aider --model openrouter/qwen/qwen3-coder-next
-#   architecture:     aider --architect --model openrouter/deepseek/deepseek-v3.2-speciale
-model: openrouter/deepseek/deepseek-v3.2
-editor-model: openrouter/deepseek/deepseek-v3.2
-
-# UI
-dark-mode: true
-pretty: true
-stream: true
-
-# Git — we control commits ourselves
-auto-commits: false
-attribute-co-authored-by: false
-git-commit-verify: true
-
-# Linting
-auto-lint: true
-
-# Repo map budget (tokens)
-map-tokens: 4096
-
-# Updates
-check-update: true
diff --git a/ai/aider/aider.model.settings.yml b/ai/aider/aider.model.settings.yml
deleted file mode 100644
index c244959..0000000
--- a/ai/aider/aider.model.settings.yml
+++ /dev/null
@@ -1,33 +0,0 @@
-# Aider model settings for OpenRouter providers
-# Deployed to ~/.aider.model.settings.yml by setup scripts
-# Docs: https://aider.chat/docs/config/adv-model-settings.html
-
-# --- Tier: daily (default) ---
-- name: openrouter/deepseek/deepseek-v3.2
-  edit_format: diff
-  use_repo_map: true
-  extra_params:
-    extra_body:
-      provider:
-        data_collection: "deny"
-        require_parameters: true
-
-# --- Tier: coding ---
-- name: openrouter/qwen/qwen3-coder-next
-  edit_format: diff
-  use_repo_map: true
-  extra_params:
-    extra_body:
-      provider:
-        data_collection: "deny"
-        require_parameters: true
-
-# --- Tier: architecture (architect model) ---
-- name: openrouter/deepseek/deepseek-v3.2-speciale
-  edit_format: diff
-  use_repo_map: true
-  extra_params:
-    extra_body:
-      provider:
-        data_collection: "deny"
-        require_parameters: true
diff --git a/powershell/profile.ps1 b/powershell/profile.ps1
index 716d2cf..f53ea08 100644
--- a/powershell/profile.ps1
+++ b/powershell/profile.ps1
@@ -11,10 +11,8 @@
 Set-Alias -Name c -Value claude
 Set-Alias -Name g -Value gemini
 
-# Aider tiers (OpenRouter)
-function ai { aider @Args }
-function aic { aider --model openrouter/qwen/qwen3-coder-next @Args }
-function aia { aider --architect --model openrouter/deepseek/deepseek-v3.2-speciale @Args }
+# OpenCode (primary AI coding agent — replaces aider)
+Set-Alias -Name oc -Value opencode
 
 # ============================================================================
 # FUNCTIONS
diff --git a/setup-linux.sh b/setup-linux.sh
index 5a2cc96..a174b58 100755
--- a/setup-linux.sh
+++ b/setup-linux.sh
@@ -335,16 +335,7 @@ fi
 chmod +x "$HOME/.claude/init-project.sh" 2>/dev/null || true
 log_success "Claude Code configured with skills"
 
-# Aider (AI pair programming)
-log_info "Setting up Aider configuration..."
-if [ -f "$CURRENT_DIR/ai/aider/aider.conf.yml" ]; then
-    cp "$CURRENT_DIR/ai/aider/aider.conf.yml" "$HOME/.aider.conf.yml"
-    log_success "Deployed .aider.conf.yml"
-fi
-if [ -f "$CURRENT_DIR/ai/aider/aider.model.settings.yml" ]; then
-    cp "$CURRENT_DIR/ai/aider/aider.model.settings.yml" "$HOME/.aider.model.settings.yml"
-    log_success "Deployed .aider.model.settings.yml"
-fi
+# Python tooling (uv + poetry) — used by hive MCP server (uvx hive-vault) and general Python workflows
 # Install uv (Python package manager — provides uvx)
 if ! command -v uv >/dev/null 2>&1; then
     log_info "Installing uv..."
@@ -376,15 +367,6 @@ else
     log_info "poetry already installed"
 fi
 
-# Install aider via uv (requires Python 3.12 — audioop removed in 3.13)
-if command -v uv >/dev/null 2>&1; then
-    log_info "Installing aider-chat via uv..."
-    uv tool install --python 3.12 aider-chat 2>/dev/null || true
-    log_success "Aider installed"
-else
-    log_warning "uv not found, skipping aider installation"
-fi
-
 # Create convenience symlinks for versioned-only binaries
 PYTHON_DIR=$(ls -d "$HOME/Applications"/python-* 2>/dev/null | sort -V | tail -1) || true
 if [ -n "$PYTHON_DIR" ] && [ -d "$PYTHON_DIR/bin" ] && [ ! -e "$PYTHON_DIR/bin/python" ]; then
diff --git a/tests/aliases.bats b/tests/aliases.bats
index 6f76456..659f4d3 100644
--- a/tests/aliases.bats
+++ b/tests/aliases.bats
@@ -32,26 +32,14 @@ setup() {
     grep -q 'alias tf="terraform"' "$ALIASES_FILE"
 }
 
-# --- Aider tier aliases ---
+# --- OpenCode alias (replaces aider tiers) ---
 
-@test "aliases.zsh defines ai alias for daily tier" {
-    grep -q 'alias ai="aider"' "$ALIASES_FILE"
+@test "aliases.zsh defines oc alias for opencode" {
+    grep -q '^alias oc="opencode"' "$ALIASES_FILE"
 }
 
-@test "aliases.zsh defines aic alias for coding tier" {
-    grep -q 'alias aic=.*qwen.*coder' "$ALIASES_FILE"
-}
-
-@test "aliases.zsh defines aia alias for architecture tier" {
-    grep -q 'alias aia=.*architect.*speciale' "$ALIASES_FILE"
-}
-
-@test "aliases.zsh aic uses openrouter provider" {
-    grep 'alias aic=' "$ALIASES_FILE" | grep -q 'openrouter/'
-}
-
-@test "aliases.zsh aia uses openrouter provider" {
-    grep 'alias aia=' "$ALIASES_FILE" | grep -q 'openrouter/'
+@test "aliases.zsh no longer defines aider tier aliases (sunset)" {
+    ! grep -qE '^alias (ai|aic|aia)=' "$ALIASES_FILE"
 }
 
 # --- Knowledge aliases ---
diff --git a/tests/opencode.bats b/tests/opencode.bats
index 930f0e4..56e261a 100644
--- a/tests/opencode.bats
+++ b/tests/opencode.bats
@@ -45,17 +45,24 @@ setup() {
     [[ $(awk '/^# OpenCode/,/^# GitHub Copilot/' "$SETUP_SCRIPT" | grep -c '2>/dev/null || true') -eq 0 ]]
 }
 
-# --- Regression: aider coexistence (PR1 keeps aider; sunset is PR2) ---
+# --- Regression: aider sunset (PR2) ---
 
-@test "setup-linux.sh STILL has aider install block (PR1 coexistence)" {
-    grep -q "# Aider (AI pair programming)" "$SETUP_SCRIPT"
-    grep -q "uv tool install --python 3.12 aider-chat" "$SETUP_SCRIPT"
+@test "setup-linux.sh no longer installs aider" {
+    ! grep -q "uv tool install --python 3.12 aider-chat" "$SETUP_SCRIPT"
+    ! grep -q "# Aider (AI pair programming)" "$SETUP_SCRIPT"
 }
 
-@test ".zsh/aliases.zsh STILL has aider aliases (PR1 coexistence)" {
-    grep -q '^alias ai="aider"' "$ALIASES_FILE"
-    grep -q '^alias aic="aider' "$ALIASES_FILE"
-    grep -q '^alias aia="aider' "$ALIASES_FILE"
+@test "setup-linux.sh keeps uv install (used by hive MCP server)" {
+    grep -q "Installing uv" "$SETUP_SCRIPT"
+    grep -q "https://astral.sh/uv/install.sh" "$SETUP_SCRIPT"
+}
+
+@test "ai/aider/ directory removed from repo" {
+    [[ ! -d "$DOTFILES_DIR/ai/aider" ]]
+}
+
+@test ".zsh/aliases.zsh no longer has aider tier aliases" {
+    ! grep -qE '^alias (ai|aic|aia)=' "$ALIASES_FILE"
 }
 
 # --- opencode.jsonc structure ---
diff --git a/tests/powershell-profile.bats b/tests/powershell-profile.bats
index 0bcd44e..fff7fbb 100644
--- a/tests/powershell-profile.bats
+++ b/tests/powershell-profile.bats
@@ -22,46 +22,21 @@ setup() {
 
 # --- Aider tier functions ---
 
-@test "profile.ps1 defines ai function for daily tier" {
-    grep -q 'function ai {' "$PROFILE_SCRIPT"
-}
-
-@test "profile.ps1 ai function calls aider" {
-    grep 'function ai {' "$PROFILE_SCRIPT" | grep -q 'aider'
-}
+# --- OpenCode alias (replaces aider tier functions, sunset) ---
 
-@test "profile.ps1 defines aic function for coding tier" {
-    grep -q 'function aic {' "$PROFILE_SCRIPT"
+@test "profile.ps1 defines oc alias for opencode" {
+    grep -qE 'Set-Alias -Name oc -Value opencode' "$PROFILE_SCRIPT"
 }
 
-@test "profile.ps1 aic function uses qwen coder model" {
-    grep 'function aic {' "$PROFILE_SCRIPT" | grep -q 'qwen.*coder'
+@test "profile.ps1 no longer defines aider tier functions (sunset)" {
+    ! grep -qE '^function (ai|aic|aia) ' "$PROFILE_SCRIPT"
 }
 
-@test "profile.ps1 defines aia function for architecture tier" {
-    grep -q 'function aia {' "$PROFILE_SCRIPT"
-}
-
-@test "profile.ps1 aia function uses architect mode" {
-    grep 'function aia {' "$PROFILE_SCRIPT" | grep -q '\-\-architect'
-}
-
-@test "profile.ps1 aia function uses deepseek speciale" {
-    grep 'function aia {' "$PROFILE_SCRIPT" | grep -q 'speciale'
-}
-
-# --- Parity check: same models in bash and PowerShell ---
-
-@test "parity: aic uses same model in aliases.zsh and profile.ps1" {
-    bash_model=$(grep 'alias aic=' "$DOTFILES_DIR/.zsh/aliases.zsh" | grep -oP 'openrouter/[^ "]+')
-    ps_model=$(grep 'function aic {' "$PROFILE_SCRIPT" | grep -oP 'openrouter/[^ }]+')
-    [[ "$bash_model" = "$ps_model" ]]
-}
+# --- Parity check: oc alias exists in both bash and PowerShell ---
 
-@test "parity: aia uses same model in aliases.zsh and profile.ps1" {
-    bash_model=$(grep 'alias aia=' "$DOTFILES_DIR/.zsh/aliases.zsh" | grep -oP 'openrouter/[^ "]+')
-    ps_model=$(grep 'function aia {' "$PROFILE_SCRIPT" | grep -oP 'openrouter/[^ }]+')
-    [[ "$bash_model" = "$ps_model" ]]
+@test "parity: oc alias defined in both aliases.zsh and profile.ps1" {
+    grep -qE '^alias oc=' "$DOTFILES_DIR/.zsh/aliases.zsh"
+    grep -qE 'Set-Alias -Name oc' "$PROFILE_SCRIPT"
 }
 
 # --- Other functions ---