refactor(glmt)!: simplify with keyword-based thinking control (v3.4.3)

YAGNI/KISS/DRY refactor removing 926 LOC of unused complexity:

- Replace budget-calculator + task-classifier with 40 LOC keyword detection

- Add 4-tier thinking: think < think hard < think harder < ultrathink

- Remove env vars: CCS_GLMT_THINKING_BUDGET, CCS_GLMT_STREAMING, CCS_GLMT_FORCE_ENGLISH

- Add streaming auto-fallback on error

- Rename CCS_DEBUG_LOG → CCS_DEBUG (backward compatible)

- Fix ultrathink effort: high → max

- Fix GLMT proxy path after restructure

Test coverage: 27 → 35 tests, all passing

Net change: +251, -1177 lines (-926 LOC, 78% reduction)

BREAKING CHANGE: Removed CCS_GLMT_THINKING_BUDGET, CCS_GLMT_STREAMING, CCS_GLMT_FORCE_ENGLISH env vars

lib/ccs

@@ -2,7 +2,7 @@
 set -euo pipefail
 
 # Version (updated by scripts/bump-version.sh)
-CCS_VERSION="3.4.1"
+CCS_VERSION="3.4.3"
 SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 readonly CONFIG_FILE="${CCS_CONFIG:-$HOME/.ccs/config.json}"
 readonly PROFILES_JSON="$HOME/.ccs/profiles.json"

lib/ccs.ps1

@@ -12,7 +12,7 @@ param(
 $ErrorActionPreference = "Stop"
 
 # Version (updated by scripts/bump-version.sh)
-$CcsVersion = "3.4.1"
+$CcsVersion = "3.4.3"
 $ScriptDir = Split-Path -Parent $MyInvocation.MyCommand.Path
 $ConfigFile = if ($env:CCS_CONFIG) { $env:CCS_CONFIG } else { "$env:USERPROFILE\.ccs\config.json" }
 $ProfilesJson = "$env:USERPROFILE\.ccs\profiles.json"