fix(install): replace broken bare 'pip install devforge-tools[...]' with verified-working git+ form

devforge-tools is NOT on public PyPI (verified 404 on pypi.org), so the
previous bare 'pip install devforge-tools[all/guard/...]' commands failed for
every user. README + AGENTS now lead with the git+ GitHub-source form and an
honest 'not on public PyPI' note; the 'devforge install <tool>' command and the
not-installed dispatch hint now build git+ URLs from each tool's repo URL; false
PyPI badges removed from README. Tests updated to assert the corrected hint.

Marketing-growth-agent run — conversion-surface repair (highest-ROI rung).
NOT pushed (W's call per OPS_CONTRACT).

Author: Coding-Dev-Tools

.github/CODEOWNERS

@@ -4,8 +4,7 @@
 DevForge CLI meta-package that installs all 11 developer tools in one command. Provides a unified `devforge` CLI entry point delegating to sub-tools: api-contract-guardian, json2sql, deploydiff, configdrift, apighost, apiauth, envault, schemaforge, click-to-mcp, and deadcode.
 
 ## Build & Test Commands
-- Install: `pip install -e .[all]` or `pip install devforge-tools`
-- Install all tools: `pip install devforge-tools[all]`
+- Install: `pip install -e ".[all]"` or `pip install "git+https://github.com/Coding-Dev-Tools/devforge-cli.git[all]"` (NOTE: `devforge-tools` is not on public PyPI — use the `git+` form)
 - Test: `pytest tests/` (or `python -m pytest tests/ -v --tb=short`)
 - Lint: `ruff check .`
 - Build: `pip install build twine && python -m build && twine check dist/*`