chore: remove all Palo IT / Gen-e2 references for public release

[salimomrani]

Summary

• Replace all occurrences of "Palo IT" (company name) and "Gen-e2" (proprietary LLM) with generic equivalents across docs, corpus, specs, and source code
• Replace real person name "Sami Henchiri" in corpus with fictional "Marc Beaumont"
• Update .gitignore to explicitly exclude .claude/worktrees/

Files changed

File	Change
corpus/rh-contacts-internes.md	"PALO IT" → "PALO Platform" ; "Sami Henchiri" → "Marc Beaumont"
DECISIONS.md	"Palo IT's internal LLM" / "Gen-e2" → generic
reports/costs.md	"Gen-e2 / Palo IT" → "custom LLM"
reports/eval.md	Eval question → generic
README.md	API examples → "Acme Corp"
backend/quality/dataset.py	Eval question → generic
backend/rag/ingestion.py	Docstring example → generic
backend/rag/provider.py	"Gen-e2" comments → generic
specs/001-rag-assistant/{spec,plan,tasks}.md	"Gen-e2" → generic
specs/011-response-feedback/contracts/feedback-api.md	Example answer → generic
.specify/memory/constitution.md	"Gen-e2" → "alternative provider"
.gitignore	Add .claude/worktrees/; rename "Debrief prep" comment

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