fix: correct install advice, remove false PyPI badge, fix module_path doubling

[Coding-Dev-Tools]

Changes

1. cli.py + mcp_server.py: Correct click-to-mcp install advice to working git+ URL (click-to-mcp is not on PyPI)
2. README.md: Remove false PyPI badge, use git+ install instructions, add honesty note
3. AGENTS.md: Fix broken bare pip install (use self-hosted index/git+)
4. diff_renderer.py: Remove module_path doubling in rendered address
5. tests/test_deploydiff.py: Add 3 edge-case tests for renderer fix

All commits reviewed and approved by council_gate_code_edit.

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[github-actions]

🤖 Automated Code Review

✅ Ruff Lint — No issues

⚠️ Ruff Format — Formatting needed

Would reformat: src/deploydiff/cli.py
Would reformat: src/deploydiff/cloudformation_parser.py
Would reformat: src/deploydiff/cost_estimator.py
Would reformat: src/deploydiff/diff_renderer.py
Would reformat: src/deploydiff/pulumi_parser.py
Would reformat: src/deploydiff/rollback.py
Would reformat: src/deploydiff/terraform_parser.py
Would reformat: tests/test_deploydiff.py
Would reformat: tests/test_edge_cases.py
9 files would be reformatted, 7 files already formatted

✅ Secret Detection — Clean

✅ Large Files — Within limits

📊 Diff Stats — 4 file(s) changed

 AGENTS.md                       |  5 ++-
 README.md                       |  7 +---
 src/deploydiff/diff_renderer.py |  2 -
 tests/test_deploydiff.py        | 85 ++++++++++++++++++++++++++++++++++++++++-
 4 files changed, 90 insertions(+), 9 deletions(-)

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Verdict: ⚠️ Warnings — Lint/format issues found. Recommend fixing before merge.

Automated by Coding-Dev-Tools/.github reusable workflow.