chore: merge upstream 0.11.10.dev0 into fork (0.11.9+adlc6)

Merge 8 upstream PRs (github#3196, github#3197, github#3198, github#3199, github#3187, github#3210, github#3214,
github#3217) from b7e67f5..bbc5f17.

- Resolved 1 textual conflict in scripts/powershell/create-new-feature.ps1
  (fork's delegation block + upstream's ContainsKey fix)
- Applied ContainsKey('Number') fix to extension script
  create-new-feature-branch.ps1 (same bug as upstream github#3196)
- All other files auto-merged cleanly

Assisted-by: opencode (autonomous)

Author: kanfil

CHANGELOG.md

@@ -2,6 +2,16 @@
 
 All notable changes to the Specify CLI and templates are documented here.
 
+# [0.11.9+adlc6] - 2026-06-29
+
+### Merged
+
+- **Upstream commits b7e67f55..bbc5f176** (8 PRs): #3217 GHES auth for `extension add --from`, #3214 Pi install URL repoint, #3210 host-less URL validation, #3187 CodeBuddy install URL, #3199 overflow error fix, #3198 setup-plan PS1 parity, #3197 expression quote-aware parsing, #3196 PowerShell `-Number 0` fix.
+
+### Fixed
+
+- **Script conflict resolution**: Combined fork's git-extension delegation block with upstream's `ContainsKey` fix in `create-new-feature.ps1`. Also applied the same `$PSBoundParameters.ContainsKey('Number')` fix to the extension's `create-new-feature-branch.ps1` (same bug, same fix).
+
 # [0.11.9+adlc5] - 2026-06-29
 
 ### Fixed

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "agentic-sdlc-specify-cli"
-version = "0.11.9+adlc5"
+version = "0.11.9+adlc6"
 description = "Specify CLI (tikalk fork). Agentic SDLC toolkit for Spec-Driven Development with pre-installed extensions and AI integrations."
 readme = "README.md"
 requires-python = ">=3.11"