fix: eight open issues across jobs, watcher, validator, simulator, MCP graph_name, JS/TS imports, .NET ignore defaults and dev-env pins - #1646

A stopped Observer cannot be restarted; stale entries made watch_directory
answer 'Already watching' for a dead observer.

…ds as identifiers (#1511)

Keywords in provably-safe positions (property access, label/rel-type,
parameter, AS-alias) no longer trip the read-only gate; clause-position
writes are still rejected, including a real SET/DELETE following an alias.

labels(<var>)[0] is now rewritten for any variable name (the literal
labels(n)[0] replace missed n1/n2), and the relationship query's bare
pattern predicate is restructured as a CONTAINS*0.. match.

#1558); drop last shadowed method (#1604)

GraphBuilder accepts a graph_name and binds its writer to
get_driver(graph_name); the handler builds a scoped builder on FalkorDB and
refuses explicitly on single-graph backends instead of silently indexing
into the default graph. Also removes the remaining shadowed
add_repository_to_graph definition #1619 missed.

obj/ contains generated source (AssemblyInfo.cs, GlobalUsings.g.cs) that
added phantom File/Module/IMPORTS rows to the graph. The golden test already
masks obj/ via GENERATED_BUILD_DIRS, so the drift never failed the test —
it only rotted the recorded golden. With the indexer itself excluding obj/,
raw output matches the comparison scope and the C# golden regenerates with
zero logical drift (the CALLS 12→7 loss reported in #1585 no longer
reproduces on current main; it was fixed by intervening parser merges).

…1526)

import_clause is an unnamed child of import_statement, so
child_by_field_name('import') always returned None and every ES import
collapsed into the bare-module fallback — the entire binding-extraction
block was dead code, and would have tested the wrong node types anyway.
The clause's children are now walked (a single clause can carry a default
and named bindings together), the namespace alias is read from the
identifier child, and both grammars are covered by binding-level tests.

Downstream effects, captured in the regenerated goldens: IMPORTS edges
carry the real binding in imported_name (was the module path), and 4
TypeScript call edges upgraded from HEURISTIC_CALLS to resolved CALLS
because named-import bindings now reach the imports map.

…project pin (#1625)

A stale venv holding an out-of-pin grammar pack makes the parser suite pass
while disagreeing with CI (the #1600 misparse exists on 1.14.x but not
0.13.x, which nearly got a correct fix closed as a no-op). The divergence is
now a named test failure pointing at the venv, not the parser.