feat: add Memory record TUI

[notgitika]

This PR adds TUI implementation to the memory record list and get commands implemented in PR #1895

PR #1906 adds the event TUI. Stacks on top of the both of them.

The flow:
Adds Memory selection followed by namespace scope entry. Supports namespace and namespace-path.

It lists records with content, strategy, and creation timeand opens up selected event as an entire JSON. Pagination, filtering, retries, empty states, and back navigation is implemented.

I tested this myself + using the TUI harness skill.

Typcheck, lint, build and test passes

Additional TUI entry points:

• Events and records are available from the top-level Memory menu and beside detail in a selected Memory's action list.
• Record-list columns preserve IDs, content, strategy IDs, and timestamps at wide terminal widths.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.82%. Comparing base (0a5e66b) to head (e740afe).

Additional details and impacted files

@@             Coverage Diff              @@
##           refactor    #1908      +/-   ##
============================================
+ Coverage     95.74%   95.82%   +0.07%     
============================================
  Files           291      294       +3     
  Lines         16234    16469     +235     
============================================
+ Hits          15544    15782     +238     
+ Misses          690      687       -3     

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