fix(install_cc_hook,session_start_hook,tools): preserve wrapper-level metadata, thread Mcp-Session-Id, add manual slider harness #1307

Job	Run time
core + backends typecheck (Python 3.11)	37s
Pi extension (windows-latest, Python 3.11, Node 24)	1m 52s
test + lint (full offline stack) (3.14)	4m 38s
test + lint (full offline stack) (3.11)	4m 36s
core floor (numpy-only, Python 3.9)	3m 59s
Pi extension (ubuntu-latest, Python 3.10, Node 22.19.0)	51s
encryption driver gate (Python 3.11)	30s
encryption driver gate (Python 3.12)	33s
test + lint (full offline stack) (3.12)	4m 40s
build + install wheel	28s
encryption driver gate (Python 3.13)	35s
coverage gate (Python 3.11)	6m 30s
repo hygiene gate (no stray DBs/logs)	7s
encryption driver gate (Python 3.14)	38s
encryption driver gate (Python 3.10)	35s
browser accessibility smoke	5m 1s
docker smoke — path gate	5s
test + lint (full offline stack) (3.10)	5m 12s
test + lint (full offline stack) (3.13)	4m 43s
docker build + health smoke	1m 39s
	47m 49s

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