fix: correct blocks() calculation and remove dead code

[Koan-Bot]

What

Fix two bugs in the blocks() method that calculates stat[12] for mocked files.

Why

• Dead code: The guard int($blocks) > $blocks was always false — $blocks was already int()'d, so int() of an integer equals itself. The entire if-block was a no-op since the method was written.
• Off-by-one: int(size/blksize + 1) unconditionally adds 1, so empty files report 1 block instead of 0, and files at exact blksize boundaries over-count (e.g., a 4096-byte file with 4096 blksize returned 2 instead of 1).

How

Replace with standard ceiling division: int((size + blksize - 1) / blksize), with an early return of 0 for empty/non-existent files.

Testing

New t/blocks.t (13 tests) covers: empty files, small files, exact boundaries, boundary+1, double boundaries, custom blksize, stat() integration, and directories.

🤖 Generated with Claude Code

[atoomic]

Failure from CI

# Failed test '/foo/bar mock stat'
# at t/mock_stat.t line 99.
# +------+-----------------------+----+---------+--------+
# | PATH | GOT                   | OP | CHECK   | LNs    |
# +------+-----------------------+----+---------+--------+
# |      | ARRAY(0x55b38ee32950) |    | <ARRAY> | 83, 97 |
# | [12] | 0                     | eq | 1       | 96     |
# +------+-----------------------+----+---------+--------+
(If this table is too small, you can use the TABLE_TERM_SIZE=### env var to set a larger size, detected size is '78')

# Seeded srand with seed '20260224' from local date.
t/mock_stat.t ....................... 

[Koan-Bot]

Rebase: fix: correct blocks() calculation and remove dead code

Branch koan.atoomic/fix-blocks-calculation has been rebased onto master and force-pushed.

Actions

• Read PR comments and review feedback
• Rebased koan.atoomic/fix-blocks-calculation onto origin/master
• Applied review feedback
• Force-pushed koan.atoomic/fix-blocks-calculation to origin

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