fix(offline): allow --offline in source checkouts, fix CHANGELOG truncation

- Simplify use_github logic: use_github = not offline (let
  scaffold_from_core_pack handle fallback to source-checkout paths)
- Remove hard-fail when core_pack/ is absent — scaffold_from_core_pack
  already falls back to repo-root templates/scripts/commands
- Fix truncated 'skill…' → 'skills' in CHANGELOG.md

Author: mnriem

CHANGELOG.md

@@ -27,7 +27,7 @@
 
 - chore: bump version to 0.3.1
 - docs: add greenfield Spring Boot pirate-speak preset demo to README (#1878)
-- fix(ai-skills): exclude non-speckit copilot agent markdown from skill… (#1867)
+- fix(ai-skills): exclude non-speckit copilot agent markdown from skills (#1867)
 - feat: add Trae IDE support as a new agent (#1817)
 - feat(cli): polite deep merge for settings.json and support JSONC (#1874)
 - feat(extensions,presets): add priority-based resolution ordering (#1855)
@@ -282,7 +282,3 @@
 
 - Add pytest and Python linting (ruff) to CI (#1637)
 - feat: add pull request template for better contribution guidelines (#1634)
-
-## [0.0.99] - 2026-02-19
-
-- Feat/ai skills (#1632)

src/specify_cli/__init__.py

@@ -1927,18 +1927,12 @@ def init(
 
     # Determine whether to use bundled assets or download from GitHub (default).
     # --offline opts in to bundled assets; without it, always use GitHub.
+    # When --offline is set, scaffold_from_core_pack() will try the wheel's
+    # core_pack/ first, then fall back to source-checkout paths. If neither
+    # location has the required assets it returns False and we error out.
     _core = _locate_core_pack()
 
-    if offline and _core is None:
-        console.print(
-            "\n[red]Error:[/red] --offline requires a wheel install with bundled assets.\n"
-            "  Install the specify-cli wheel (it must contain core_pack/).\n"
-            "  See: docs/installation.md → Enterprise / Air-Gapped Installation\n"
-            "Remove --offline to download from GitHub instead."
-        )
-        raise typer.Exit(1)
-
-    use_github = not (offline and _core is not None)
+    use_github = not offline
 
     if use_github and _core is not None:
         console.print(