Rename Dep marker to Dependency and align published wiki with copier template

[timkpaine]

Follow-up to #239 (now merged). Two independent changes:

1. Rename the Dep marker to Dependency

The explicit container-dependency marker added in #239 was named Dep. Every other public dependency-related type in the library spells the word out (DependencySpec, EvaluationDependency), as do the sibling markers FromContext and Lazy. This renames the public marker Dep → Dependency for consistency:

from ccflow import Dependency, Flow, FromContext

@Flow.model
def total(values: list[Dependency[int]]) -> int:
    return sum(values)

Also silences a benign Pydantic serializer warning: model_dump_json() on a Dependency-marked model containing a CallableModel leaf previously emitted PydanticSerializationUnexpectedValue. The generated (schema-only, SkipValidation) field annotation for dependency-slot params now maps to Any, so no warning is emitted; ccflow still validates leaves against the real annotation.

2. Fix the published wiki (align with copier template)

The GitHub wiki had duplicate/colliding Contribute, Build-from-Source, and Local-Development-Setup pages. The copier template (python-project-templates/base) stores these under docs/wiki/contribute/, and the copier uplift (bd35d2e) added them there but left the old top-level copies behind. GitHub's wiki engine flattens page slugs, so the two sets collided.

This removes the stale top-level duplicates and keeps the contribute/ versions, which are byte-identical to the template's rendered output. The flat sidebar links ([Build from Source](Build-from-Source)) continue to resolve to the contribute/ pages via gollum.

[github-actions]

Test Results

    1 files  ±0      1 suites  ±0   2m 42s ⏱️ -5s
1 209 tests ±0  1 207 ✅ ±0  2 💤 ±0  0 ❌ ±0 
1 215 runs  ±0  1 213 ✅ ±0  2 💤 ±0  0 ❌ ±0 

Results for commit 31763ea. ± Comparison against base commit 4a18b4e.

♻️ This comment has been updated with latest results.

[codecov]

Codecov Report

❌ Patch coverage is 90.38462% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 93.02%. Comparing base (4a18b4e) to head (31763ea).

Files with missing lines	Patch %	Lines
ccflow/_flow_model_binding.py	75.00%	2 Missing and 1 partial ⚠️
ccflow/examples/flow_model/flow_model_example.py	0.00%	1 Missing ⚠️
...amples/flow_model/flow_model_hydra_builder_demo.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #244   +/-   ##
=======================================
  Coverage   93.02%   93.02%           
=======================================
  Files         164      164           
  Lines       18610    18612    +2     
  Branches     1234     1235    +1     
=======================================
+ Hits        17312    17314    +2     
  Misses       1068     1068           
  Partials      230      230           

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